Response to a slide

[Greg Osenbach]

David.  I just now am reading through this email chain and what you
described in this last one is exactly what I am attempting to do and that is
exactly one of problems I am seeing.  I only had the few minutes to get it
set up so have not had any time to try another method yet.  They requested
they have it look through faster than what I had it set at, but could not
run it any faster without having to kit the stop key several times to get it
to stop  :)

Thank you for the suggestion, I'll try it out this evening and let you know
how it goes.

Greg

(ps.  Thanks for all the very detailed help you give on this list!!)

On Thu, Feb 26, 2009 at 9:29 AM, David McFarlane <mcfarla9 at msu.edu> wrote:

>
> I wrote,
>
> > I had an experiment where this technique solved a lot of problems.
>
> Sorry to keep posting in piece-meal fashion, but just to explain a bit...
>
> We had a task where we rapidly looped through a set of slides (i.e., new
> slide on each screen refresh) and wanted to stop when the subject
> responded.  I first did it as you described, testing for a response to
> the slides themselves.  But much of time the program would not detect
> the subject response.  When I thought it through and looked at the
> timing, I realized that in this case the program spent a good proportion
> of its time between each slide, whereas it could collect responses only
> during each slide's run; e.g., if a slide appeared every 17 ms, with 7
> ms for in-between-slide setup and 10 ms of actual slide running (even
> though it does remain on the screen for the full 17 ms), my program got
> responses only during the 10 ms interval so 7/17 = 40% of the time my
> program could not get a response!
>
> I solved the problem using one pre-loop object with extended input as
> described in my previous post, and I have described this just in case it
> can ever do anyone else any good.
>
> -- David McFarlane, Professional Faultfinder
>
> >
>

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