Adjusting length of trial based on performance

[Rachel S.]

Thanks David. I submitted this question to PST a few weeks ago and am
still waiting to hear back.

Thanks for your help.

On Aug 5, 11:08 am, David McFarlane <mcfar... at msu.edu> wrote:
> Rachel,
>
> Stock reminder:  1) I do not work for PST.  2) PST's trained staff
> takes any and all questions athttp://support.pstnet.com/e%2Dprime/support/login.asp, and they
> strive to respond to all requests in 24-48 hours (although current
> estimates are more like 10 days) -- 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...
>
> For a hint on how to programmatically adjust stimulus durations,
> first study Chapter 4, "Using E-Basic", of the User's Guide that came
> with E-Prime.  Then look at the "ContingentStimulusDuration" example
> downloadable from PST.
>
> For another hint on how to make trials contingent on subject
> performance, see the "CriterionForExit" example downloadable from PST.
>
> -- David McFarlane, Professional Faultfinder
>
> At 8/4/2010 08:53 AM Wednesday, you wrote:
>
>
>
> >I am working on a program that does the following:
>
> >Participants are presented with a fixation cross for 500ms, followed
> >by a fixation cross and 2 words (one to the left of the fixation cross
> >and one to the right). Then, a string of "X"es with either a "C" or
> >"O" in the middle replaces one of the words. The participant's job is
> >to indicate which letter they see by pressing C or O on the response
> >box.
>
> >If the participant gets 3 trials in a row incorrect and/or does not
> >respond before the next trial begins during 3 trials in a row, how can
> >I have e-prime adjust the presentation time of the string of "X"es so
> >that they are presented longer? And then, once they get 10 trials in a
> >row correct, how can I reduce the presentation time of the "X"es? In
> >other words, I would like to be able to adjust the presentation time
> >of the "X"es throughout the program based upon correct and incorrect/
> >no responses. Any thoughts on how to do this would be much
> >appreciated.
>
> >Thank you,
> >Rachel- Hide quoted text -
>
> - Show quoted text -

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