Dear Shane and Chris,
The problem is with these lines : corr1 <- Nth(des,1)==0 corr2 <- Nth(des,2)==0 Strangely, the variable saved will be according to the previous test (last trial). Printing corr1 for each trial before and after the if made it clear. We don’t see this pattern for the hits as this test is overwritten during the “if”. Another peculiar behavior is that sometimes, corr on the very first trial is 0. As it isn’t systematic, I have a really hard time figuring what happens. I have been using such y <- x==0 in other scripts and it seems to work as expected for me. Shane, this is highly disturbing. If statements like y <- x==0 are not always giving the same behavior, then it’s important to know we shouldn’t use them anymore. Or at least know in which circumstances it happens. Best regards, Laurent Schüpbach From: Shane Mueller<mailto:[email protected]> Sent: Friday, March 25, 2016 04:26 To: Christopher Higginson<mailto:[email protected]>; [email protected]<mailto:[email protected]> Subject: Re: [Pebl-list] n-Back Chris, I believe that somebody reported that to me recently, so I don't think you are incorrect. I haven't verified this yet, but it if it isn't correct, then columns may be mislabeled. Here is the logic--maybe you have a fix? the variable corr1 (and corr2) starts out with a default value that should be correct if no response were made: corr1 <- Nth(des,1)==0 corr2 <- Nth(des,2)==0 It sounds like this Then there are two blocks of code that record whether each of two possible responses are correct. The second one is this, which would be the code that gets tested when the second response times out after the first response is complete: if(resp2 == "<lshift>") { Show(respLeft) corr1 <- Nth(des,1) }elseif(resp2=="<rshift>") { Show(respRight) corr2 <- Nth(des,2) } Here, neither of these would run if there were a timeout, and so corr1 would default to the original value above. So maybe the original default score is backward? I think in des, it is marked a 0 if there is no n-back match and 1 if there is, so if no response is made, it should be marked as correct in that case; so I'm a bit puzzled what the happening. If you can send me an example data file and tell me what the incorrect coding is, that would be helpful. Shane On Tue, 2016-03-22 at 15:36 +0000, Christopher Higginson wrote: > Dear PEBL Project, > I'm in the process of revising the n-Back task from the battery to > better meet my needs. I will certainly pass along my edited version > of the task when it is complete. I'm concerned about a potential > error in the data file that is created. The column "corr1" (which > appears to indicate whether the response is correct or not) seems to > generate a score of "0" when a correct "timeout" (i.e., no response) > response is made immediately after a "lshift" response. Has anyone > else noticed this or am I missing something? Any assistance would be > much appreciated! > Chris > > > > Christopher I. Higginson, Ph.D. > Associate Professor > Department of Psychology > Loyola University Maryland > 4501 North Charles Street > Baltimore, MD 21210 > 410-617-2461 > > Disclaimer: This electronic message may contain information that is > proprietary, confidential, or legally privileged or protected. It is > intended only for the use of the individual(s) and entity named in > the message. If you are not an intended recipient of this message, > please notify the sender immediately and delete the material from > your computer. Do not deliver, distribute or copy this message and do > not disclose its contents or take any action in reliance on the > information it contains. > --------------------------------------------------------------------- > --------- > Transform Data into Opportunity. > Accelerate data analysis in your applications with > Intel Data Analytics Acceleration Library. > Click to learn more. > http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 > _______________________________________________ > Pebl-list mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/pebl-list ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 _______________________________________________ Pebl-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/pebl-list ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785471&iu=/4140 _______________________________________________ Pebl-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/pebl-list
