presenting video stimuli in e-prime

[Brandon Cernicky]

Although movie playing is the top feature for E-Prime
2.0 later this year, E-Prime 1.x does not support
playing videos during critical timing trials (it can
play instruction movies through power point).

Since you mentioned your movies are 1000ms, at a rate
of 30 frames a second, you would have aprx 30-40
images per movie.  If you are capable/willing to split
each frame up into its own .bmp file, you can display
them in E-Prime one after another to create an
animation.

Specifically, there is a sample on the PST Web Support
site called "sprite manager" that could be used for a
paradigm similar to what you have described,
especially if the movies you wish to present are not
full screen since Sprite Manager helps allocate video
resources beneficially versus brute force canvas
object creation.  The info/help document that
SpriteManager installs off the Start/E-Prime menu is
very valid reading for any paradigm that involves
images.  Using SpriteManager coupled with small framed
text display objects and appropriate InLine script,
your paradigm could potentially be implemented.

Using Sprite Manager or brute force canvas objects in
E-Prime will permit for your paradigm to have the
critical timing you would need.

-Brandon

~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Brandon S. Cernicky
Senior Software Engineer
Psychology Software Tools


> I am a new user to e-prime and new to this list so >
apologies if these
> questions have been discussed before.
>
> 1)  I wish to display short video clips (about >
1000ms).  What is the
> best way to achieve this in e-prime?
>
> 2) These video clips would appear centrally.  >
However, I would also like
> to display a probe (a letter) in one of 4 locations
> in the periphery of
> the display.  These probes would appear with >
different onset times
> relative to the beginning of each video clip (e.g >
video clip starts and
> then a probe appears 200ms/500ms/800ms afterwards >
and thus while the
> video is still playing.
>
> 3) The dependent variable in this study would be >
the reaction time to
> the probe as a function of the video content.  My >
final question is
> about timing.  How much timing accuracy do you >
sacrifice if you are
> displaying videos and collecting RTs >
simultaneously?  My testing machine
> has a 3GHz processor.
>
>
> If anyone has any help or advice I would be most >
grateful!
>
> Robbie Cooper
> PhD Research Student
> Face Perception Lab
> Department of Psychology
> University of Stirling
> Stirling
> FK9 4LA
> UK
> +44 (0)1786 466375
>


		
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