The person depicted in the news story is likely malingering retrograde memory disorder. There has never been a verified case of retrograde amnesia greater than a few hours that has resulted from a mild head injury. What they likely didn't mention is that he is in litigation over this workplace fall or wants complete disability compensation. I have seen two or three cases like this over the years and they can be easily "caught" in their own lies because it is difficult to maintain this when you actually have memories. There was only one case that continues to befuddle me. I interviewed the patient approx 3 years after he acquired amnesia. The case is reported in the paper below. He didn't have a TBI but manifested a very convincing retrograde amnesia.
Retrograde amnesia for forty years. Andrews, Ellen; Poser, Charles M; Kessler, Marc. Cortex: A Journal Devoted to the Study of the Nervous System and Behavior. Vol.18(3), Oct 1982, pp. 441-458. Mike Williams Drexel University ---------------------------------------------------------------------- Subject: Retrograde Amnesia on ABC Nightline From: Rick Froman <[email protected]> Date: Tue, 20 Apr 2010 18:49:05 -0500 X-Message-Number: 11 It is not heavy on facts or theories (it does show some scans) but it does provide a real life example of someone showing what life is like when the last 40 some years are totally gone from your memory. You may or may not be surprised to find that it appears to be harder on those around you than it is on you just because you don't have a memory of what you have lost. I don't know how long it will be available at this site: http://abcnews.go.com/nightline but it should be available for a few days in the archive at this site: http://abcnews.go.com/Video/playerIndex?catId=1206872 It is the 4-19 episode. Rick Dr. Rick Froman, Chair Division of Humanities and Social Sciences John Brown University Siloam Springs, AR 72761 [email protected]<mailto:[email protected]> ---------------------------------------------------------------------- Subject: RE: Top 10 challenging concepts From: "Paul C Bernhardt" <[email protected]> Date: Tue, 20 Apr 2010 19:58:37 -0400 X-Message-Number: 12 Thanks for the various responses to the Biserial question. I love that I learn new things every day! Challenging Concepts to Teach: Sleeper Effect (persuasion) Kelley's Covariation Theory (attributions) Paul C. Bernhardt Department of Psychology Frostburg State University Frostburg, Maryland -----Original Message----- From: Jim Clark [mailto:[email protected]] Sent: Tue 4/20/2010 4:20 PM To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] Top 10 challenging concepts Hi Confusion might be between biserial corr and point-biserial. Latter is simply standard r between dichotomous variable X and quantitative variable Y. Hence, does not violate standard conditions for Pearson r. Biserial, however, attempts to estimate from dichotomized quantitative variable X and quantitative variable Y what the r would be for quantitative X. Whatever procedure is used can produce r > 1, as alluded to below as the "the well known fact that r* can be greater than 1" (albeit not well known by me until this discussion). http://biomet.oxfordjournals.org/cgi/pdf_extract/42/1-2/205 Take care Jim James M. Clark Professor of Psychology 204-786-9757 204-774-4134 Fax [email protected] >>> Paul Bernhardt <[email protected]> 20-Apr-10 2:42:49 PM >>> I am skeptical that the Biserial correlation can exceed an absolute value of 1. Can you provide an example in which it does that? Paul Bernhardt Dept of Psychology Frostburg State University pcbernhardt _at_ frostburg _dot_ edu On Apr 20, 2010, at 8:44 AM, Wuensch, Karl L wrote: > > > Actually, there are some correlation coefficients that can exceed one (the biserial, for example). > > Tell your students to square r before comparing one with another. > Give them a set of data and the plot and the accompanying negative r. Then invert or reflect one of the variables and present the plot and positive r. They should get the message then. > > Try a criminal courtroom analogy. Assume innocence. Type I = convict an innocent defendant. Type II = let a criminal get off. > > Cheers, > > Karl W. > > From: [email protected] [mailto:[email protected]] > Sent: Monday, April 19, 2010 8:43 AM > To: Teaching in the Psychological Sciences (TIPS) > Subject: Re: [tips] Top 10 challenging concepts > > > > A couple of editorial comments (unwanted I am sure but I don't care): > > > differentiating between the phallic and genital stage > Since there is very little validity or empirical support for Freud's theoretical constructs of development and personality, > I would say that there is no need to waste precious class time on this distinction m- > It helps the modern scientific psychologist not at all... > Let the English, Philosophy or History prof deal with it. > > > -why a -7.0 correlation coefficient is more significant than a +5.0 There are no such things as > a -7.0 correlation coefficient or a 5.0 one. All "r"s range between -1.00 and +1.00 > > > > > > Nancy Melucci > Long Beach City College > Long Beach CA > > -----Original Message----- > From: Mike Palij <[email protected]> > To: Teaching in the Psychological Sciences (TIPS) <[email protected]> > Cc: Mike Palij <[email protected]> > Sent: Sun, Apr 18, 2010 10:19 pm > Subject: re: [tips] Top 10 challenging concepts > > On Sun, 18 Apr 2010 16:06:30 -0700, Michael Sylvester wrote: > >I am attempting to compile a list of the top 10 challenging concepts > >to explain to students.So far I have come up with the following from > >my courses: > > -Type 1 and type 2 error > > - differentiating between the phallic and genital stage > > -negative reinforcement > > -positive punishment > > -why a -7.0 correlation coefficient is more significant than a +5.0 > > - assimilation and accomodation in Piagetian theory > > - diathesis stress theory of schizophrenia > > Why do fools fall in love? > > -Mike Palij > New York University > [email protected] > > P.S. Do Sylvesterian correlation coefficients exceed +/- 1.00? > If so, how are they calculated? > > > --- > You are currently subscribed to tips as: [email protected]. > To unsubscribe click here: > http://fsulist.frostburg.edu/u?id=12993.aba36cc3760e0b1c6a655f019a68b878&n=T&l=tips&o=2094 > > or send a blank email to > leave-2094-12993.aba36cc3760e0b1c6a655f019a68b...@fsulist.frostburg.edu > --- > > You are currently subscribed to tips as: [email protected]. > > To unsubscribe click here: > http://fsulist.frostburg.edu/u?id=13060.c78b93d4d09ef6235e9d494b3534420e&n=T&l=tips&o=2098 > > > (It may be necessary to cut and paste the above URL if the line is broken) > > or send a blank email to > leave-2098-13060.c78b93d4d09ef6235e9d494b35344...@fsulist.frostburg.edu > > > --- > > You are currently subscribed to tips as: [email protected]. > > To unsubscribe click here: > http://fsulist.frostburg.edu/u?id=13441.4e79e96ebb5671bdb50111f18f263003&n=T&l=tips&o=2109 > > > (It may be necessary to cut and paste the above URL if the line is broken) > > or send a blank email to > leave-2109-13441.4e79e96ebb5671bdb50111f18f263...@fsulist.frostburg.edu > --- You are currently subscribed to tips as: [email protected]. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13251.645f86b5cec4da0a56ffea7a891720c9&n=T&l=tips&o=2115 or send a blank email to leave-2115-13251.645f86b5cec4da0a56ffea7a89172...@fsulist.frostburg.edu --- You are currently subscribed to tips as: [email protected]. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13441.4e79e96ebb5671bdb50111f18f263003&n=T&l=tips&o=2116 or send a blank email to leave-2116-13441.4e79e96ebb5671bdb50111f18f263...@fsulist.frostburg.edu ---------------------------------------------------------------------- Subject: Re: Biserial r. From: "Jim Clark" <[email protected]> Date: Tue, 20 Apr 2010 23:31:30 -0500 X-Message-Number: 13 Hi Following SPSS simulation generates 1000 samples of 100 x y pairs with known population rho (#r = .9 here), then dichotomizes x to create categorical predictor c, which is then used to calculate rb, the biserial r (I had to track down various algorithms for this, but it seems correct ... mean rb, for example, is very close to rho). Anyway, it illustrates that for extreme values of rho, rb can in fact exceed 1 (presumably same at other tail). 12 of 1000 rbs were > 1 in one simulation I ran. Perhaps there are other factors that also influence likelihood of getting values beyond normal range for rs (e.g., size of categories). input program. comp #r = .9. loop samp = 1 to 1000. leave samp. loop obs = 1 to 100. comp x = rv.norm(0,1). comp y = rv.norm(0,1)*SQRT(1-#r**2) + x*#r. end case. end loop. end loop. end file. end input program. comp c = 0. if x > -.2 c = 1. if c = 0 y0 = y. if c = 1 y1 = y. aggre /outfile = * /presort /break = samp /m0 = mean(y0) /m1 = mean(y1) /p = fgt(c, 0) /q = flt(c, 1) /sy = sd(y). compute z = idf.normal(q, 0, 1). compute ord = .3989*2.71828**-((z**2)/2). compute rb = (m1 - m0)*((p*q/ord)/sy). freq rb /forma = notable /hist. comp rbx = (rb<-1) or (rb>+1). freq rbx. It is perhaps worth noting that there are other widely used statistics that produce "impossible" values. The Bonferroni test, for example, can produce ps > 1 if one computes LSD p x # comparisons (as reported in SPSS, for example). SPSS rounds these to 1. Perhaps similar convention is adopted for rb? I'm hard-pressed to decide whether to thank Karl for raising this interesting question, or berate him for taking me away from my marking to do this exercise! Or perhaps the latter should be a thanks as well? Take care Jim James M. Clark Professor of Psychology 204-786-9757 204-774-4134 Fax [email protected] >>> "Wuensch, Karl L" <[email protected]> 20-Apr-10 4:03:26 PM >>> See: The Theory of Correlation Between Two Continuous Variables when One is Dichotomized Author(s): Robert F. Tate Source: Biometrika, Vol. 42, No. 1/2 (Jun., 1955), pp. 205-216 Cheers, Karl W. ________________________________ From: Paul Bernhardt [mailto:[email protected]] Sent: Tuesday, April 20, 2010 3:43 PM To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] Top 10 challenging concepts I am skeptical that the Biserial correlation can exceed an absolute value of 1. Can you provide an example in which it does that? Paul Bernhardt Dept of Psychology Frostburg State University pcbernhardt _at_ frostburg _dot_ edu On Apr 20, 2010, at 8:44 AM, Wuensch, Karl L wrote: Actually, there are some correlation coefficients that can exceed one (the biserial, for example). Tell your students to square r before comparing one with another. Give them a set of data and the plot and the accompanying negative r. Then invert or reflect one of the variables and present the plot and positive r. They should get the message then. Try a criminal courtroom analogy. Assume innocence. Type I = convict an innocent defendant. Type II = let a criminal get off. Cheers, Karl W. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] Sent: Monday, April 19, 2010 8:43 AM To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] Top 10 challenging concepts A couple of editorial comments (unwanted I am sure but I don't care): differentiating between the phallic and genital stage Since there is very little validity or empirical support for Freud's theoretical constructs of development and personality, I would say that there is no need to waste precious class time on this distinction m- It helps the modern scientific psychologist not at all... Let the English, Philosophy or History prof deal with it. > -why a -7.0 correlation coefficient is more significant than a +5.0 There are no such things as a -7.0 correlation coefficient or a 5.0 one. All "r"s range between -1.00 and +1.00 Nancy Melucci Long Beach City College Long Beach CA -----Original Message----- From: Mike Palij <[email protected]<mailto:[email protected]>> To: Teaching in the Psychological Sciences (TIPS) <[email protected]<mailto:[email protected]>> Cc: Mike Palij <[email protected]<mailto:[email protected]>> Sent: Sun, Apr 18, 2010 10:19 pm Subject: re: [tips] Top 10 challenging concepts On Sun, 18 Apr 2010 16:06:30 -0700, Michael Sylvester wrote: >I am attempting to compile a list of the top 10 challenging concepts >to explain to students.So far I have come up with the following from >my courses: > -Type 1 and type 2 error > - differentiating between the phallic and genital stage > -negative reinforcement > -positive punishment > -why a -7.0 correlation coefficient is more significant than a +5.0 > - assimilation and accomodation in Piagetian theory > - diathesis stress theory of schizophrenia Why do fools fall in love? -Mike Palij New York University [email protected]<mailto:[email protected]> P.S. 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