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Why can't a medium PROVE the ability exists?

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  • Closed Accounts Posts: 27,857 ✭✭✭✭Dave!



    Yeah very compelling
    She told distraught relatives that Melissa Barthelemy, 24, was in a shallow grave near water and close to a sign containing the letter "G".

    Near water eh? Try find somewhere near the Bronx (where she went missing from) that isn't near water :rolleyes:

    bronx_map.jpg

    And 'close' to a sign containing the letter G. How close does it have to be to count as a hit? 5 feet? 50? 500? And how many street signs do you suppose are up around New York? You could throw a stone in any direction and you'd be pretty unlucky not to be 'near' to a sign with a G on it.

    Nice try though. How many predictions do you suppose she got wrong? I guess we'll never know, cos people like you have no interest in keeping track of them.


  • Registered Users Posts: 1,123 ✭✭✭GodlessM


    KeithAFC wrote: »
    We see mediums make a lot of claims and out of all the things in the paranormal, mediumship is one of them which we can really test and see if there is anything to it. When will a medium take the challenge to prove that you can indeed talk to spirit or predict the future and basically give mediumship the boost it needs because at the moment, all i see is a lot of people making good money from it but nothing else.

    There is so many mediums in the world, so many big name mediums too, a lot of nice mediums as well but at the end of the day, we just don't have any proof in what they do is real.

    There is many ways to test mediumship out but no one has ever been precise in what they say or do. A lot of it is generalised comments.

    First thing is first, mediums supposedly communicate with the dead, not predict the future, that is a psychic.

    Secondly the reason a medium can't prove the existance of an afterlife is rather simple; there's nothing their abilities entail that goes beyond taking their word for it. They cannot materialise the spirit or make you hear it, so how does one expect them to prove anything?


  • Registered Users Posts: 33,617 ✭✭✭✭Penn


    Dave! wrote: »
    Yeah very compelling



    Near water eh? Try find somewhere near the Bronx (where she went missing from) that isn't near water :rolleyes:

    bronx_map.jpg

    And 'close' to a sign containing the letter G. How close does it have to be to count as a hit? 5 feet? 50? 500? And how many street signs do you suppose are up around New York? You could throw a stone in any direction and you'd be pretty unlucky not to be 'near' to a sign with a G on it.

    Nice try though. How many predictions do you suppose she got wrong? I guess we'll never know, cos people like you have no interest in keeping track of them.

    Add to that the fact is was 9 months after she said it that they were found. The cops probably ignored her because they knew it'd take more than 9 months to search everywhere near the Bronx, near water, near a sign with a G in it.

    She couldn't give them another letter or two? Or even said there's two G's in the name?


  • Posts: 0 [Deleted User]


    Dave! wrote: »
    Nice try though. How many predictions do you suppose she got wrong? I guess we'll never know, cos people like you have no interest in keeping track of them.



    I wasnt trying anything, i just happened to read that yesterday.

    Here is a question for you. How many psychics give police information ?


  • Closed Accounts Posts: 27,857 ✭✭✭✭Dave!


    I wasnt trying anything, i just happened to read that yesterday.

    Here is a question for you. How many psychics give police information ?
    Probably lots? I'm sure they throw stuff at the police all the time, and I'm sure that some superstitious or desperate/frustrated police take the information seriously. Most of the predictions will lead to nothing and we'll never hear about them, and others will get lucky, in which case they'll appear in the papers and be shouted from the rooftops.


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  • Closed Accounts Posts: 27,857 ✭✭✭✭Dave!


    Ahh the Bem studies, tiny effect detected, which cannot be replicated by other researchers!

    There's an interesting article about this research, which I'll post in the Paranormal forum (cos there was a thread on it in there already I think)


  • Registered Users Posts: 1,433 ✭✭✭MrMojoRisin


    This is the original, peer-reviewed study done on Uri Geller in Stanford in 1974 and the results were published in Nature. Whatever people's personal view of Geller is, nobody, to the best of my knowledge, has completely quashed the feats demonstrated in the study.

    SRI's Official Scientific Paper




    We present results of experiments suggesting the existence of one or more perceptual modalities through which individuals obtain information about their environment, although this information is not presented to any known sense. The literature 1-3 and our observations lead us to conclude that such abilities can be studied under laboratory conditions.


    We have investigated the ability of certain people to describe graphical material or remote scenes shielded against ordinary perception. In addition, we performed pilot studies to determine if electroencephalographic (EEG) recordings might indicate perception of remote happenings even in the absence of correct overt responses.


    We concentrated on what we consider to be our primary responsibility -- to resolve under conditions as unambiguous as possible the basic issue of whether a certain class of paranormal perception phenomena exists. So we conducted our experiments with sufficient control, utilising visual, acoustic and electrical shielding, to ensure that all conventional paths of sensory input were blocked. At all times we took measures to prevent sensory leakage and to prevent deception, whether intentional or unintentional.
    Our goal is not just to catalogue interesting events, but to uncover patterns of cause-effect relationships that lend themselves to analysis and hypothesis in the forms with which we are familiar in scientific study. The results presented here constitute a first step towards that goal; we have established under known conditions a data base from which departures as a function of physical and psychological variables can be studied in future work.


    First, we conducted experiments with Mr. Uri Geller in which we examined his ability, while located in an electrically shielded room, to reproduce target pictures drawn by experimenters located at remote locations. Second, we conducted double-blind experiments with Mr. Pat Price, in which we measured his ability to describe remote outdoor scenes many miles from his physical location.
    Finally, we conducted preliminary tests using EEGs, in which subjects were asked to perceive whether a remote light was flashing, and to determine whether a subject could perceive the presence of the light, even if only at a noncognitive level of awareness.


    In preliminary testing Geller apparently demonstrated an ability to reproduce simple pictures (line drawings) which had been drawn and placed in opaque sealed envelopes which he was not permitted to handle. But since each of the targets was known to at least one experimenter in the room with Geller, it was not possible on the basis of the preliminary testing to discriminate between Geller's direct perception of envelope contents and perception through some mechanism involving the experimenters, whether paranormal or subliminal. So we examined the phenomenon under conditions designed to eliminate all conventional information channels, overt or subliminal. Geller was separated from both the target material and anyone knowledgeable of the material, as in the experiments of ref. 4.
    In the first part of the study a series of 13 separate drawing experiments were carried out over 7 days. No experiments were deleted from the results presented here.


    At the beginning of the experiment either Geller or the experimenters entered a shielded room so that from that time forward Geller was at all times visually, acoustically, and electrically shielded from personnel and material at the target location. Only following Geller's isolation from the experimenters was a target chosen and drawn, a procedure designed to eliminate pre-experiment cueing. Furthermore, to eliminate the possibility of pre-experiment target forcing, Geller was kept ignorant as to the identity of the person selecting the target and as to the method of target selection. This was accomplished by the use of three different techniques: (1) pseudo-random technique of opening a dictionary arbitrarily and choosing the first word that could be drawn (Experiments 1-4); (2) targets, blind to experimenters and subject, prepared independently by SRI scientists outside the experimental group (following Geller's isolation) and provided to the experimenters during the course of the experiment (Experiments 5-7, 11-13); and (3) arbitrary selection from a target pool decided upon in advance of daily experimentation and designed to provide data concerning information content for use in testing specific hypotheses (Experiments 8-10). Geller's task was to reproduce with pen on paper the line drawing generated at the target location. Following a period of effort ranging from a few minutes to half an hour, Geller either passed (when he did not feel confident) or indicated he was ready to submit a drawing to the experimenters, in which case the drawing was collected before Geller was permitted to see the target.


    To prevent sensory cueing of the target information, Experiments 1 through 10 were carried out using a shielded room in SRI's facility for EEG research. The acoustic and visual isolation is provided by a double-walled steel room, locked by means of an inner and outer door, each of which is secured with a refrigerator-type locking mechanism. Following target selection when Geller was inside the room, a one-way audio monitor, operating only from the inside to the outside, was activated to monitor Geller during his efforts. The target picture was never discussed by the experimenters after the picture was drawn and brought near the shielded room. In our detailed examination of the shielded room and the protocol used in these experiments, no sensory leakage has been found.


    The conditions and results for the 10 experiments carried out in the shielded room are displayed in Table 1 and Fig. 1. All experiments except 4 and 5 were conducted with Geller inside the shielded room. In Experiments 4 and 5, the procedure was reversed. For those experiments in which Geller was inside the shielded room, the target location was in an adjacent room at a distance of about 4 m, except for Experiments 3 and 8, in which the target locations were, respectively, an office at a distance of 475 m and a room at a distance of about 7 M.
    n3_400.jpg
    A response was obtained in all experiments except Numbers 5-7. In Experiment 5, the person-to-person link was eliminated by arranging for a scientist outside the usual experimental group to draw a picture, lock it in the shielded room before Geller's arrival at SRI, and leave the area. Geller was then led by the experimenters to the shielded room and asked to draw the picture located inside the room. He said that he got no clear impression and therefore did not submit a drawing. The elimination of the person-to-person link was examined further in the second series of experiments with this subject.


    Experiments 6 and 7 were carried out while we attempted to record Geller's EEG during his efforts to perceive the target pictures. The target pictures were, respectively, a tree and an envelope. He found it difficult to hold adequately still for good EEG records, said that he experienced difficulty in getting impressions of the targets, and again submitted no drawings.
    Experiments 11 through 13 were carried out in SRI's Engineering Building, to make use of the computer facilities available there. For these experiments, Geller was secured in a double-walled, copper-screen Faraday cage 54 m down the hall and around the corner from the computer room. The Faraday cage provides 120 dB attenuation for plane wave radio frequency radiation over a range of 15 kHz to 1 GHz. For magnetic fields the attenuation is 68 dB at 15 kHz and decreases to 3 dB at 60 Hz. Following Geller's isolation, the targets for these experiments were chosen by computer laboratory personnel not otherwise associated with either the experiment or Geller, and the experimenters and subject were kept blind as to the contents of the target pool.
    n2_400.jpg
    For Experiment 11, a picture of a kite was drawn on the face of a cathode ray tube display screen, driven by the computer's graphics programme. For Experiment 12, a picture of a church was drawn and stored in the memory of the computer. In Experiment 13, the target drawing, an arrow through a heart (Fig. 2c), was drawn on the face of the cathode ray tube and then the display intensity was turned off so that no picture was visible.
    To obtain an independent evaluation of the correlation between target and response data, the experimenters submitted the data for judging on a 'blind' basis by two SRI scientists who were not otherwise associated with the research. For the 10 cases in which Geller provided a response, the judges were asked to match the response data with the corresponding target data (without replacement). In those cases in which Geller made more than one drawing as his response to the target, all the drawings were combined as a set for judging. The two judges each matched the target data to the response data with no error. For either judge such a correspondence has an a priori probability, under the null hypothesis of no information channel, of p 1/(10!) = 3 x 10 to the power -7.
    A second series of experiments was carried out to determine whether direct perception of envelope contents was possible without some person knowing of the target picture.


    One hundred target pictures of everyday objects were drawn by an SRI artist and sealed by other SRI personnel in double envelopes containing black cardboard. The hundred targets were divided randomly into groups of 20 for use in each of the three days' experiments. On each of the three days of these experiments, Geller passed. That is, he declined to associate any envelope with a drawing that he made, expressing dissatisfaction with the existence of such a large target pool. On each day he made approximately 12 recognisable drawings, which he felt were associated with the entire target pool of 100. On each of the three days, two of his drawings could reasonably be associated with two of the 20 daily targets. On the third day, two of his drawings were very close replications of two of that day's target pictures. The drawings resulting from this experiment do not depart significantly from what would be expected by chance.
    In a simpler experiment Geller was successful in obtaining information under conditions in which no persons were knowledgeable of the target. A double-blind experiment was performed in which a single 3/4 inch die was placed in a 3 x 4 x 5 inch steel box. The box was then vigorously shaken by one of the experimenters and placed on the table, a technique found in control runs to produce a distribution of die faces differing nonsignificantly from chance. The orientation of the die within the box was unknown to the experimenters at that time. Geller would then write down which die face was uppermost. The target pool was known, but the targets were individually prepared in a manner blind to all persons involved in the experiment. This experiment was performed ten times, with Geller passing twice and giving a response eight times. In the eight times in which he gave a response, he was correct each time. The distribution of responses consisted of three 2s, one 4, two 5s, and two 6s. The probability of this occurring by chance is approximately one in 10 to the power 6.
    In certain situations significant information transmission can take place under shielded conditions. Factors which appear to be important and therefore candidates for future investigation include whether the subject knows the set of targets in the target pool, the actual number of targets in the target pool at any given time, and whether the target is known by any of the experimenters.


    It has been widely reported that Geller has demonstrated the ability to bend metal by paranormal means. Although metal bending by Geller has been observed in our laboratory, we have not been able to combine such observations with adequately controlled experiments to obtain data sufficient to support the paranormal hypothesis.


    A study by Osis 5 led us to determine whether a subject could describe randomly chosen geographical sites located several miles from the subject's position and demarcated by some appropriate means (remote viewing). This experiment carried out with Price, a former California police commissioner and city councilman, consisted of a series of double-blind, demonstration-of-ability tests involving local targets in the San Francisco Bay area which could be documented by several independent judges. We planned the experiment considering that natural geographical places or man-made sites that have existed for a long time are more potent targets for paranormal perception experiments than are artificial targets prepared in the laboratory. This is based on subject opinions that the use of artificial targets involves a 'trivialisation of the ability' as compared with natural preexisting targets.


    In each of nine experiments involving Price as subject and SRI experimenters as a target demarcation team, a remote location was chosen in a double-blind protocol. Price, who remained at SRI, was asked to describe this remote location, as well as whatever activities might be going on there.


    Several descriptions yielded significantly correct data pertaining to and descriptive of the target location.
    In the experiments a set of twelve target locations clearly differentiated from each other and within 30 minutes driving time from SRI had been chosen from a target-rich environment (more than 100 targets of the type used in the experimental series) prior to the experimental series by an individual in SRI management, the director of the Information Science and Engineering Division, not otherwise associated with the experiment. Both the experimenters and the subject were kept blind as to the contents of the target pool, which were used without replacement.


    An experimenter was closeted with Price at SRI to wait 30 minutes to begin the narrative description of the remote location. The SRI locations from which the subject viewed the remote locations consisted of an outdoor park (Experiments 1, 2),- the double-walled copper-screen Faraday cage discussed earlier (Experiments 3, 4, and 6-9), and an office (Experiment 5). A second experimenter would then obtain a target location from the Division Director from a set of traveling orders previously prepared and randomised by the Director and kept under his control. The target demarcation team (two to four SRI experimenters) then proceeded directly to the target by automobile without communicating with the subject or experimenter remaining behind. Since the experimenter remaining with the subject at SRI was in ignorance both as to the particular target and as to the target pool, he was free to question Price to clarify his descriptions. The demarcation team then remained at the target site for 30 minutes after the 30 minutes allotted for travel. During the observation period, the remote-viewing subject would describe his impressions of the target site into a tape recorder. A comparison was then made when the demarcation team returned.


    Price's ability to describe correctly buildings, docks, roads, gardens, and so on, including structural materials, color, ambiance, and activity, sometimes in great detail, indicated the functioning of a remote perceptual ability. But the descriptions contained inaccuracies as well as correct statements. To obtain a numerical evaluation of the accuracy of the remote viewing experiment, the experimental results were subjected to independent judging on a blind basis by five SRI scientists who were not otherwise associated with the research. The judges were asked to match the nine locations, which they independently visited, against the typed manuscripts of the tape-recorded narratives of the remote viewer. The transcripts were unlabelled and presented in random order. The judges were asked to find a narrative which they would consider the best match for each of the places they visited. A given narrative could be assigned to more than one target location. A correct match requires that the transcript of a given date be associated with the target, of that date. Table 2 shows the distribution of the judges' choices.


    Among all possible analyses, the most conservative is a permutation analysis of the plurality vote of the judges' selections assuming assignment without replacement, an approach independent of the number of judges. By plurality vote, six of the nine descriptions and locations were correctly matched. Under the null hypothesis (no remote viewing and a random selection of descriptions without replacement), this outcome has an a priori probability of p = 5.6 x 10 to the power -4 since, among all possible permutations of the integers one through nine, the probability of six or more being in their natural position in the list has that value. Therefore, although Price's descriptions contain inaccuracies, the descriptions are sufficiently accurate to permit the judges to differentiate among the various targets to the degree indicated.


    An experiment was undertaken to determine whether a physiological measure such as EEG activity could be used as an indicator of information transmission between an isolated subject and a remote stimulus. We hypothesised that perception could be indicated by such a measure even in the absence of verbal or other overt indicators. 6, 7
    It was assumed that the application of remote stimuli would result in responses similar to those obtained under conditions of direct stimulation. For example, when normal subjects are stimulated with a flashing light, their EEG typically shows a decrease in the amplitude of the resting rhythm and a driving of the brain waves at the frequency of the flashes 8. We hypothesised that if we stimulated one subject in this manner ( a sender), the EEG of another subject in a remote room with no flash present (a receiver), might show changes in alpha (9-11 Hz) activity, and possibly EEG driving similar to that of the sender.


    We informed our subject that at certain times a light was to be flashed in a sender's eyes in a distant room, and if the subject perceived that event, consciously or unconsciously, it might be evident from changes in his EEG output. The receiver was seated in the visually opaque, acoustically and electrically shielded double-walled steel room previously described. The sender was seated in a room about 7 m from the receiver.
    To find subjects who were responsive to such a remote stimulus, we initially worked with four female and two male volunteer subjects, all of whom believed that success in the experimental situation might be possible. These were designated 'receivers'. The senders were either other subjects or the experimenters. We decided beforehand to run one or two sessions of 36 trials each with each subject in this selection procedure, and to do a more extensive study with any subject whose results were positive.


    A Grass PS-2 photostimulator placed about 1 m in front of the sender was used to present flash trains of 10 s duration. The receiver's EEG activity from the occipital region (0z), referenced to linked mastoids, was amplified with a Grass SP-1 preamplifier and associated driver amplifier with a bandpass of 1-120 Hz. The EEG data were recorded on magnetic tape with an Ampex SP 300 recorder.
    On each trial, a tone burst of fixed frequency was presented to both sender and receiver, and was followed in one second by either a 10 s train off lashes or a null flash interval presented to the sender. Thirty-six such trials were given in an experimental session, consisting of 12 null trials - no flashes following the tone - 12 trials of flashes at 6 f.p.s. and 12 trials of flashes at 16 f.p.s., all randomly intermixed, determined by entries from a table of random numbers. Each of the trials generated an 11-s EEG epoch. The last 4 s of the epoch was selected for analysis to minimise the desynchronising action of the warning cue. This 4-s segment was subjected to Fourier analysis on a LINC 8 computer.


    Spectrum analyses gave no evidence of EEG driving in any receiver, although in control runs the receivers did exhibit driving when physically stimulated with the flashes. But of the six subjects studied initially, one subject (H. H.) showed a consistent alpha blocking effect. We therefore undertook further study with this subject.




    Data from seven sets of 36 trials each were collected from this subject on three separate days. This comprises all the data collected to date with this subject under the test conditions described above. The alpha band was identified from average spectra, then scores of average power and peak power were obtained from individual trials and subjected to statistical analysis.


    Of our six subjects, H. H. had by far the most monochromatic EEG spectrum. Figure 3 shows an overlay of the three averaged spectra from one of this subject's 36-trial runs, displaying changes in her alpha activity for the three stimulus conditions.


    Mean values for the average power and peak power for each of the seven experimental sets are given in Table 3. The power measures were less in the 16 f.p.s. case than in the 0 f.p.s. in all seven peak power measures and in six out of seven average power measures. Note also the reduced effect in the case in which the subject was informed that no sender was present (Run 3). It seems that overall alpha production was reduced for this run in conjunction with the subject's expressed apprehension about conducting the experiment without a sender. This is in contrast to the case (Run 7) in which the subject was not informed.


    Siegell's two-tailed t approximation to the nonparametric randomisation test 9 was applied to the data from all sets, which included two sessions in which the sender was removed. Average power on trials associated with the occurrence of 16 f.p.s. was significantly less than when there were no flashes t = 2.09, d.f. = 118, P < 0.04). The second measure, peak power, was also significantly less in the 16 f. p. s. conditions than in the null condition ( t = 2.16, d.f. = 118, P < 0.03). The average response in the 6 f.p.s. condition was in the same direction as that associated with 16 f.p.s., but the effect was not statistically significant.


    Spectrum analyses of control recordings made from saline with a 12 kOhm resistance in place of the subject with and without the addition of a 10 Hz, 50 microvolt test signal applied to the saline solution, revealed no indications of flash frequencies, nor perturbations of the 10 Hz signal. These controls suggest that the results were not due to system artifacts. Further tests also gave no evidence of radio frequency energy associated with the stimulus.


    Subjects were asked to indicate their conscious assessment for each trial as to which stimulus was generated. They made their guesses known to the experimenter via one-way telegraphic communication. An analysis of these guesses has shown them to be at chance, indicating the absence of any supraliminal cueing. So, arousal as evidenced by significant alpha blocking occurred only at the noncognitive level of awareness.
    We hypothesised that the protocol described here may prove to be useful as a screening procedure for latent remote perceptual ability in the general population.


    From these experiments we conclude that:
    - A channel exists whereby information about a remote location can be obtained by means of an as yet unidentified perceptual modality.
    - As with all biological systems, the information channel appears to be imperfect, containing noise along with the signal.
    - While a quantitative signal-to-noise ratio in the information-theoretical sense cannot as yet be determined, the results of our experiments indicate that the functioning is at the level of useful information transfer.
    It may be that remote perceptual ability is widely distributed in the general population, but because the perception is generally below an individuals level of awareness, it is repressed or not noticed. For example, two of our subjects (H.H. and P.P.) had not considered themselves to have unusual perceptual ability before their participation in these experiments.
    Our observation of the phenomena leads us to conclude that experiments in the area of so-called paranormal phenomena can be scientifically conducted, and it is our hope that other laboratories will initiate additional research to attempt to replicate these findings.


    This research was sponsored by The Foundation for Parasensory Investigation, New York City.


    We thank Mrs. Judith Skutch, Dr. Edgar D. Mitchell of the Institute of Noetic Sciences - as well as our SRI associates, Mr. Bonnar Cox, Mr. Earle Jones and Dr. Dean Brown - for support and encouragement. Constructive suggestions by Mrs. Jean Mayo, Dr. Charles Tart, University of California, and Dr. Robert Ornstein and Dr. David Galin of the Langley Porter Neuropsychiatric Institute are acknowledged.
    Russell Targ
    Harold Puthoff
    Electronics and Bioengineering Laboratory, Stanford Research Institute, Menlo Park, California 94025
    Fig 1. Target pictures and responses drawn by Uri Geller under shielded conditions.
    Fig 2. Computer drawings and responses drawn by Uri Geller.
    a, Computer drawing stored on video display;
    b, computer drawing stored in computer memory only;
    c, computer drawing stored on video display with zero intensity.
    Fig 3. Occipital EEG spectra, 0-20 Hz, for one subject (H. H.) acting as receiver, showing amplitude changes in the 9-11 Hz band as a function of strobe frequency. Three cases: 0,6, and 16 f.p.s. (12 trial averages).
    Tables
    1 Pratt, J., Rhine, J.B., Stuart, C., and Greenwood, J., Extra Sensory Perception after Sixty Years (Henry Holt, New York, 1940).
    2 Soal, S., and Bateman, F., Modern Experiments in Telepathy (Faber and Faber, London, 1954).
    3 Vasilliev, L.L., Experiments in Mental Suggestion (ISMI Publications, Hampshire, England, 1963).
    4 Musso, J.R., and Granero, M., J. Parapsychology, 37, 13-37 (1973).
    5 Osis, K., ASPR Newsletter, No. 14 (1972).
    6 Tart, C.T., Physiological Correlates of Psi Cognition, Int. J. Parapsychology, V, No. 4 (1963).
    7 Dean, E.D., Int. J. Neuropsychiatry, 2 (1966).
    8 Hill, D., and Parr, G., Electroencephalography: A Symposium on its Various Aspects (Macmillan, New York, 1963).
    9 Siegel, S., Nonparametric Statistics for the Behavioural Sciences, pp. 152-156 (McGraw-Hill, New York, 1956).


  • Registered Users Posts: 1,433 ✭✭✭MrMojoRisin


    Dave! wrote: »
    Ahh the Bem studies, tiny effect detected, which cannot be replicated by other researchers!

    There's an interesting article about this research, which I'll post in the Paranormal forum (cos there was a thread on it in there already I think)

    Tiny or not, it materialised.

    AFAIK, only one researcher has attempted to replicate it, but he was inaccurate in replicating the exact lab. conditions - hence his failure.


  • Closed Accounts Posts: 6,388 ✭✭✭gbee


    KeithAFC wrote: »
    We see mediums make a lot of claims and out of all the things in the paranormal,

    Can't answer your question, but I always took them the same way as Church, faith. I've stopped believing in both.

    That said, I do believe we all have a sixth sense which might 'activate' from time to time. I once believed that one could harness and enhance this power, but I'm not so sure anymore. Too many medical conditions have been diagnosed that can explain [away] so much.


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  • Closed Accounts Posts: 27,857 ✭✭✭✭Dave!


    Tiny or not, it materialised.

    AFAIK, only one researcher has attempted to replicate it, but he was inaccurate in replicating the exact lab. conditions - hence his failure.

    You should read some analysis from science bloggers about this study, because the general consensus seems to be that, rather than the study showing that psi is a real phenomenon, instead it points to flaws in how research and statistical analysis is done, and how false-positives can occur. Even by chance alone, you would expect a few false-positives, but the essential point is that, for results of an experiment which overturns the fundamentals of the universe as we know to be taken very seriously, there would need to be a significant effect size, and it would need to be replicated, and in your analysis you would need to take into account the implausibility of the hypothesis.

    Here's an editorial that is intended to accompany the publication of Bem's results...
    Why Psychologists Must Change the Way They Analyze Their Data: The Case of Psi
    Here we discuss several limitations of Bem’s experiments on psi; in particular, we show that the data analysis was partly exploratory, and that one-sided p-values may overstate the statistical evidence against the null hypothesis. We reanalyze Bem’s data using a default Bayesian t-test and show that the evidence for psi is weak to nonexistent.

    ...

    The most important flaws in the Bem experiments, discussed below in detail, are the following: (1) confusion between exploratory and confirmatory studies; (2) insufficient attention to the fact that the probability of the data given the hypothesis does not equal the probability of the hypothesis given the data (i.e., the fallacy of the transposed conditional); (3) application of a test that overstates the evidence against the null hypothesis, an unfortunate tendency that is exacerbated as the number of participants grows large.

    A few quotes from other researchers...

    http://www.csicop.org/specialarticles/show/back_from_the_future
    ...the correlation of effect size (as well as significance level) with sample size is highly significant across this set of Bem’s experiments, but is in the wrong direction! “Effect size,” simply put, refers in this case to the magnitude of the difference between the observed scoring rate and the chance rate. Larger samples provide a better opportunity to detect such a difference if it is truly there, and thus effect size should increase with increased sample size. However, in Bem’s experiments, the effect size correlates negatively, -.91, with sample size, indicating that the claimed effect is smaller when the sample size is larger. Statistical power is a related concept, and refers to the ability to detect an when it is actually there. Hyman notes that while power (he uses the log of significance probability as a proxy for power) should be positively correlated with sample size (technically with the square root of sample size), in this series of studies, the correlation is approximately .80, in the wrong direction once again. This raises a bright red flag and further erodes confidence with regard to the conduct of this research.


    http://theness.com/neurologicablog/?p=2701
    The studies showing evidence for this new phenomenon should show:

    1- A statistically significant effect

    2- The effect size should also be significant, meaning that it is well beyond the range of statistical and methodological “noise” that studies in that field are likely to generate. (This differs by field – electrons are more predictable and quantifiable than the subjective experiences of people, for example.)

    3- The results should be reproducible. Once you develop a study design, anyone who accurately reproduces the study protocol should get similar results.

    ...

    In the final analysis, this new data from Bem is not convincing at all. It shows very small effects sizes, within the range of noise, and has not been replicated. Further, the statistical analysis used was biased in favor of finding significance, even for questionable data.

    http://ignoranceanduncertainty.wordpress.com/2011/01/24/oh-that-esp-paper/
    Now, Bem’s evidence is almost entirely statistical. His entire case depends on demonstrating greater-than-chance experimental effects. This kind of demonstration hinges on three important matters: Which school of statistical inference one subscribes to, how great a risk one is willing to run of mistaking a chance effect for a real one, and how great a risk of mistaking a real effect for one due to chance. Bem, along with the vast majority of experimental psychologists, subscribes to the Neyman-Pearson-Fisher school of statistical inference. This school has been strongly criticized for more than a half-century, and among its most effective critics are those subscribing to Bayesian statistical methods.

    So, enter the Bayesians with two rebuttals to be published along with Bem’s paper. The Bayesian critiques and correctives proposed by Wagenmakers et al. and Rouder and Morey are valid but not new. Without going into technical aspects, both of these critiques begin with claims that Bem’s statistical analyses are flawed because Neyman-Pearson-Fisher methods are flawed. I agree, as have numerous statistically sophisticated folks for more than 50 years—The conventional (statistical) significance tests used by psychologists are incoherent and biased against the “null hypothesis” (in Bem’s case, the absence of the retroactive psi-effects he’s looking for). Again, let me declare myself as believing that the discipline of Psychology would be much better off using Bayesian statistics.

    http://psychsciencenotes.blogspot.com/2010/11/brief-note-daryl-bem-and-precognition.html
    (in comments section)
    Bem's lack of mechanism is a serious problem, as that link talks about, because he's proposing something that literally makes no sense given much of the rest of science. Given this, and given the analysis concerns, his wonderful data may simply be a fishing trip that got lucky for no reason other than everyone gets lucky eventually.

    There have been three attempts at replication, all of which failed:
    1
    2
    Can't find a link to the 3rd one

    There are more in the works AFAIK

    Richard Wiseman has set up a registry for people to register interest in conducting replication experiments before they actually do them. The reason for the registry:
    Bem’s experimental design is straightforward and appears to reliably produce evidence for psychic functioning. Because of this, several researchers have expressed an interest in replicating his work. Although this is good (attempted replications are an important part of establishing whether an effect is genuine), such large numbers of unsystematic replications can be problematic. Some researchers might, for example, start an experiment, obtain initial results that are not in line with their desired outcome, and terminate the study early. Alternatively, they may complete the study but not publish it. These types of issues make it difficult to assess whether an effect has been replicated.

    So we'll find out a bit more about replication attempts after Wiseman et al perform a meta-analysis.

    Even if you disregard all of the above -- in the context of all the research done on psi, this is not going to overturn anything. It has failed time and again.


  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    MrStuffins wrote: »
    Of course not, don't be so ridiculous!!

    so tell me,, what would you consider to be proof..

    tell me,,, after all, you all seem to skim over questions and not offer answers to most things...

    so ill ask again..

    what would you consider proof of mediumship

    and how would you design a test to prove paranormal activity..??


  • Registered Users Posts: 19,192 ✭✭✭✭MrStuffins


    Package wrote: »
    so tell me,, what would you consider to be proof..

    tell me,,, after all, you all seem to skim over questions and not offer answers to most things...

    so ill ask again..

    what would you consider proof of mediumship

    and how would you design a test to prove paranormal activity..??

    To think that, because someone doesn't believe in something, proof cannot exist for them is completely perverse!

    I will answer your question no problem, BUT, before I do, since the burden of proof is on the medium, how would you propose the medium would prove to me that they are legit?


  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    MrStuffins wrote: »
    To think that, because someone doesn't believe in something, proof cannot exist for them is completely perverse!

    I will answer your question no problem, BUT, before I do, since the burden of proof is on the medium, how would you propose the medium would prove to me that they are legit?

    perverse? well i would consider the readings ive got and the readings ive given as proof. ok, so ive never materialsied a ghost...

    but i asked first. so if you wanted me to prove i was a medium. how would i go about doing so?


  • Registered Users Posts: 19,192 ✭✭✭✭MrStuffins


    Package wrote: »
    perverse? well i would consider the readings ive got and the readings ive given as proof. ok, so ive never materialsied a ghost...

    but i asked first. so if you wanted me to prove i was a medium. how would i go about doing so?

    For someone to want to prove something to someone, the non-belief must first exist. Therefore, by your logic, nothing can ever be proved? Come on!

    I realised you asked first, and I honestly am not trying to dodge your question, but I will answer it gladly after you tell me exactly what it is you as a medium would bring to the table to use as proof?

    After all, it's not as if there is some sort of set scientific experiment to use where I could prove or disprove your mediumship.


  • Registered Users Posts: 810 ✭✭✭Laisurg


    My personal opinion on why they can't prove it is because its all a wind up.
    Then again if you were psychic would you tell someone? I'd just play online poker a lot :)


  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    Laisurg wrote: »
    Then again if you were psychic would you tell someone? I'd just play online poker a lot :)

    the ol preconseption that being psychic makes you great at poker and meas you should be able to sin the lotto and see the future :eek:
    MrStuffins wrote: »
    For someone to want to prove something to someone, the non-belief must first exist. Therefore, by your logic, nothing can ever be proved? Come on!

    I realised you asked first, and I honestly am not trying to dodge your question, but I will answer it gladly after you tell me exactly what it is you as a medium would bring to the table to use as proof?

    After all, it's not as if there is some sort of set scientific experiment to use where I could prove or disprove your mediumship.

    this is a fair enough point ish really. see. the only thing a medium can bring to the table is doing a reading for someone, bringing through messages from dead friends and family. maybe telling you thing off the bat about your old nan, descriptions of her looks, traits and personalities, sometimes names and sometimes dates that are important to you and your family. sometimes messsages so personal that really, a stranger could never know.

    but this never seems enough to skeptics..

    on the other hand, i understand the frustration of skeptics that nobody seems to have proven, without a shadow of a doubt, the existtance of the paranormal. belive me, if i could,, i would jump at the chance. problem is, i cant aterialse gold, and i cant move things with the power of my mind.

    not yet anyway, :D


  • Registered Users Posts: 19,192 ✭✭✭✭MrStuffins


    Don't you think though that if the psychic ability was real they'd prove it?

    What did you think of Derren Brown's show on Joe Power? Don't you think if he was really speaking to the dead he would've been able to actually speak to the dead?


  • Closed Accounts Posts: 27,857 ✭✭✭✭Dave!


    Package wrote: »
    this is a fair enough point ish really. see. the only thing a medium can bring to the table is doing a reading for someone, bringing through messages from dead friends and family. maybe telling you thing off the bat about your old nan, descriptions of her looks, traits and personalities, sometimes names and sometimes dates that are important to you and your family. sometimes messsages so personal that really, a stranger could never know.

    but this never seems enough to skeptics..

    I'd start to pay attention if a medium were to do what you said -- except, with a random stranger (selected by the person performing the study), in a controlled environment, without getting any feedback off the sitter. They should be able to do this consistently with different sitters, and with a high degree of accuracy. The person performing the study should be a skeptic, too.

    Of course, they'd have to give rather specific information, because something like "your gran was born around 1930, she has grey hair, and she looks like a little old woman" may be accurate, but it's not very impressive ;)


  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    Dave! wrote: »
    I'd start to pay attention if a medium were to do what you said -- except, with a random stranger (selected by the person performing the study), in a controlled environment, without getting any feedback off the sitter. They should be able to do this consistently with different sitters, and with a high degree of accuracy. The person performing the study should be a skeptic, too.

    Of course, they'd have to give rather specific information, because something like "your gran was born around 1930, she has grey hair, and she looks like a little old woman" may be accurate, but it's not very impressive ;)

    so put yourself forward man...


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  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    MrStuffins wrote: »
    Don't you think though that if the psychic ability was real they'd prove it?

    What did you think of Derren Brown's show on Joe Power? Don't you think if he was really speaking to the dead he would've been able to actually speak to the dead?

    Joe Power is a big joke... read back over this thread.. if Derren really wanted to disprove the myth, he should have picked on of the big boys...

    after all.

    if the local football mad hero wantet to prove he was a good footballer, he wouldnt challenge ronaldo to a football match,, he would pick someone from Scuntorp UTD or something. makes his look better ya see


  • Registered Users Posts: 19,192 ✭✭✭✭MrStuffins


    Package wrote: »
    Joe Power is a big joke... read back over this thread.. if Derren really wanted to disprove the myth, he should have picked on of the big boys...

    I've been in this thread from the start.

    So you don't think Joe Power is a "big boy"? Who would you describe as one of the big boys in this case?


  • Closed Accounts Posts: 27,857 ✭✭✭✭Dave!


    Package wrote: »
    so put yourself forward man...
    NO THANKS

    You're the one who's so keen to prove it's true, go off and organise it yourself, go approach some scientists. I'm happy enough as an outside observer, I'm not a scientist.


  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    MrStuffins wrote: »
    I've been in this thread from the start.

    So you don't think Joe Power is a "big boy"? Who would you describe as one of the big boys in this case?

    have a read of this one for more clarifictation

    http://boards.ie/vbulletin/showthread.php?t=2056144146
    Dave! wrote: »
    NO THANKS

    You're the one who's so keen to prove it's true, go off and organise it yourself, go approach some scientists. I'm happy enough as an outside observer, I'm not a scientist.

    fair enough so... im ok not proving it. im happy with mediums reading for the people who need readings..

    so i suppose ill bid you adue and hope minnyminor gets back and doesnt have the same attitude.


  • Registered Users Posts: 1,433 ✭✭✭MrMojoRisin


    Dave! wrote: »
    You should read some analysis from science bloggers about this study,

    I don't have much interest in, or regard for, bloggers in general, least of all science bloggers. Just more people with their own opinions (to which they're most entitled to have), yet nobody owns the patent to what is truth, myself included.
    Dave! wrote: »
    [...] because the general consensus seems to be that, rather than the study showing that psi is a real phenomenon, instead it points to flaws in how research and statistical analysis is done, and how false-positives can occur. Even by chance alone, you would expect a few false-positives,

    Oh, they point out these flaws after the fact? They've had decades to address shortcomings in how research is conducted. How convenient and ironic; for all their pedantic whining about how experimentation is flawed, they never had the meticulousness to bother their holes rectifying this in the first place before the study was done. Great job, lads/ladies. :rolleyes: Lol.

    Dave! wrote: »
    [...] but the essential point is that, for results of an experiment which overturns the fundamentals of the universe as we know to be taken very seriously, there would need to be a significant effect size, and it would need to be replicated, and in your analysis you would need to take into account the implausibility of the hypothesis.

    Nobody suggested that the fundamental laws of physics could be transformed as a result of one study only, but it's food for thought all the same. It takes time. Again, if the original hypothesis was implausible, why didn't some peripheral clever clogs step in and adjust it to start with?

    Dave! wrote: »
    There have been three attempts at replication, all of which failed:
    1
    2
    Can't find a link to the 3rd one

    There are more in the works AFAIK

    Oh, good. Three attempts is a fairly piss-poor amount for something of this nature and its potentially profound implications.
    Dave! wrote: »
    Richard Wiseman has set up a registry for people to register interest in conducting replication experiments before they actually do them. The reason for the registry:


    So we'll find out a bit more about replication attempts after Wiseman et al perform a meta-analysis.

    Even if you disregard all of the above -- in the context of all the research done on psi, this is not going to overturn anything. It has failed time and again.

    I'm not disregarding all of the above. It's just another side to the story. Just because baldy Wiseman and friends step in and shake their heads doesn't automatically render the results of the other researchers invalid. Actually, that's quite disrespectful. Who made Wiseman the Grand Daddy of Empiricism?


  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    MrStuffins wrote: »
    Don't you think though that if the psychic ability was real they'd prove it?

    well everything is not proven untill its proven my good man. after all, people believe the world was flat untill it was proven to be round. that doesnt mean that before it was discovered, it was actually flat? it was still round, it just hadnt been proven yet.


  • Closed Accounts Posts: 27,857 ✭✭✭✭Dave!


    I don't have much interest in, or regard for, bloggers in general, least of all science bloggers. Just more people with their own opinions (to which they're most entitled to have), yet nobody owns the patent to what is truth, myself included.

    Well that's a bit silly, and the boldened bit is more evidence of the contempt for science that most of your kind feel simply because the scientific community is not willing to endorse your unproven nonsense.

    Science blogs give a good insight into the conversations that are taking place among scientific researchers and observers, and ignoring them is a good way to keep out of the loop and to miss out on valuable, informed opinions from people in the field.

    If you didn't disregard science blogs, then you might have an idea of how Bem's research is being received by his colleagues. But, you don't really care about that, do you? :) You just want your beliefs endorsed.
    Oh, they point out these flaws after the fact? They've had decades to address shortcomings in how research is conducted. How convenient and ironic; for all their pedantic whining about how experimentation is flawed, they never had the meticulousness to bother their holes rectifying this in the first place before the study was done. Great job, lads/ladies. :rolleyes: Lol.

    No, they've been arguing about these statistical problems for decades; Bem's research is not so ground-breaking that they've had to suddenly change how everything is done to accommodate it. These studies just illustrate the point that many people have been making for a long time.
    Nobody suggested that the fundamental laws of physics could be transformed as a result of one study only, but it's food for thought all the same. It takes time. Again, if the original hypothesis was implausible, why didn't some peripheral clever clogs step in and adjust it to start with?

    Dunno what you're on about here. The hypothesis being referred to is that psi is real. You can't exactly adjust that. The point being made is that, given the implausibility of the existance of psi (given what we already know about the universe), you'd need to adjust your statistical analysis to account for this.
    Oh, good. Three attempts is a fairly piss-poor amount for something of this nature and its potentially profound implications.

    I'm sure there's more ongoing, pretty bad goings so far though.
    I'm not disregarding all of the above. It's just another side to the story. Just because baldy Wiseman and friends step in and shake their heads doesn't automatically render the results of the other researchers invalid. Actually, that's quite disrespectful. Who made Wiseman the Grand Daddy of Empiricism?

    Dunno what you're on about again. You don't think it's a good idea to keep track of replication attempts? Since nobody else has taken up the mantle here, Wiseman has taken on the task. Nobody made him grand daddy of anything -- but if someone wants to help with a meta-analysis of this research, then they can contribute. Pretty simple. This is pretty helpful, because there's something called the file-drawer effect where research that shows a negative outcome will tend to not be published. So if someone were to fail to reproduce this experiment, then they might not bother submitting it for publication, and we'd lose that data. Knowing in advance who is planning to attempt it means we can keep track and preserve the integrity that is sometimes lacking in post-hoc meta-analyses.


  • Registered Users Posts: 33,617 ✭✭✭✭Penn


    Package wrote: »
    well everything is not proven untill its proven my good man. after all, people believe the world was flat untill it was proven to be round. that doesnt mean that before it was discovered, it was actually flat? it was still round, it just hadnt been proven yet.

    Difference is, the people who started believing that the world was round, then went and proved it. So, as the thread title says, why can't a medium PROVE the ability exists? Mediums have been around for at least 150 years. Still no proof. Not only that, but in the early 20th century, Harry Houdini debunked a lot mediums himself. Add to that people who have performed as mediums coming forth explaining how they did it and saying that they never spoke to the dead.


  • Banned (with Prison Access) Posts: 1,322 ✭✭✭Package


    Barrington wrote: »
    Difference is, the people who started believing that the world was round, then went and proved it.

    yeah watch this space
    Barrington wrote: »
    Add to that people who have performed as mediums coming forth explaining how they did it and saying that they never spoke to the dead.

    such as?


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  • Registered Users Posts: 19,192 ✭✭✭✭MrStuffins


    Package wrote: »
    yeah watch this space

    Your flat earth comparison is boring!

    I presume you know what Cold Reading is. Why do you think I should believe that those who are claiming to be mediums are not in fact using Cold Reading and are in fact speaking to the dead?

    And do you not think that if they COULD prove it, they would step up to every single challenge put to them and prove it? this doesn't happen.

    if I had the ability to actually speak to dead people, i'd be shouting it from the roof tops and anyone who didn't believe me, I would show them!


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