replacement for wrong trials

[David McFarlane]

Marina,

Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
takes any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they 
strive to respond to all requests in 24-48 hours -- this is pretty 
much their substitute for proper documentation, so make full use of 
it.  3) If you do get an answer from PST Web Support, please extend 
the courtesy of posting their reply back here for the sake of others.

That said, here is my take...

So you want to rerun only trials with incorrect responses until the 
subject responds correctly?  I don't see any way to do that without 
some inline code.  For examples, look at the CriterionForExit and and 
RerunErrors examples downloadable from the PST web site (warning:  in 
general PST programmers are pretty sloppy, so do not take these as 
models of proper programming practice, take them only as rough 
exercises to illustrate certain features and then abstract from there).

-- David McFarlane, Professional Faultfinder
"When all is said and told, the 'naturalness' with which we use our 
native tongues boils down to the ease with which we can use them for 
making statements the nonsense of which is not obvious."  -- Edsger 
W. Dijkstra, "On the foolishness of 'natural language programming'" 
(http://www.cs.utexas.edu/users/EWD/transcriptions/EWD06xx/EWD667.html)


>Hi, I'm intersted in replacing only wrong trials in a block. The block
>is setted to chose trials randomly (without replacement). My goal is
>to have the same number of correct trials for each condition, since
>I'm also collecting EEG data and it would be better for comparisons of
>the electrophysiological data to have the same number of epochs. I'm
>collecting reaction time data from all of the 10 hand fingers, and
>it's already known (from previous experiments we've made) that the
>probability of wrong responses are different for each finger. Is there
>an easy way to do it? A hard one would be usefull as well, but my
>programming skills are (very) limmited.
>
>I deeply appreciate your help,
>
>Marina

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