stopping video playback beyond Duration (response contingent)?

[David Vinson]

just a quick follow-up to note that some of my timing issues have been 
solved - I finally found some posts by David McFarlane that were very 
helpful with a design like mine.

Using extended input to collect response data rather than piecing it 
together from multiple display objects:
http://groups.google.com/group/e-prime/msg/e30fc88284d85e3c

Using SetNextTargetOnsetTime to schedule upcoming events:
http://groups.google.com/group/e-prime/msg/3f1b16b48a068f14

However i'm still looking for ideas about stopping a video in mid-play 
once its Duration has expired.

cheers,
David V


> I have been wrestling with a MovieDisplay problem and wonder if anyone
> on the list has any ideas.
>
> A simplified version of my trial sequence can be described like this:
>
> time 0: MovieDisplay begins
> time 600: ImageDisplay begins while movie continues
> time 2500: end of typical video (range 2000-3100).
> Keypress can occur at any time during or after this sequence.
>
> Feedback on accuracy occurs after the response has been made.
>
> My current design starts with a MovieDisplay: keypress response,
> duration/time limit = 600, stop after = no and end action = terminate.
>
> If MovieDisplay.RT > 0 the ImageDisplay is skipped, otherwise it's
> displayed with duration = infinite (waits forever for a keyboard
> response). I log variables for the ImageDisplay and use inline code to
> update the logged variables for MovieDisplay as well.
>
> Then feedback occurs based on MovieDisplay.ACC. The problem is that
> often feedback doesn't appear (it's actually being displayed behind the
> video which continues until it is finished - video always takes display
> priority).
>
> Is there any way to stop the video once a keypress to MovieDisplay or
> ImageDisplay is recorded? I've tried various ways to deal with this (eg
> setting Durations to 0 and using inline code to keep time) but have not
> figured out a way to pull the plug on a video.
>
> I have been able to make the feedback display visible, for example
> adding a long Wait object before the feedback, or increasing the
> duration of the feedback object, or displaying the feedback off center -
> but I'd prefer if participants didn't have to wait until the end of
> video clips if they have already made early responses.
>
> any ideas or suggestions would be very helpful!


-- 
David Vinson, Ph.D.
Senior Postdoctoral Researcher
Cognitive, Perceptual and Brain Sciences Research Department
University College London
26 Bedford Way, London WC1H 0AP
Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)

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