Problem

[Michael Worden]

A straightforward way to do this is to have two procedures, one
presents stimulus A first and the other presents stimulus B first.
Add a wait or other object in the middle if you want to have variable
ISIs.  I threw together a quick example using two slide objects with
visual stimuli (it's a simple modification to make one of these a
sound object).  You can find the example at
ftp://sacklerinstitute.org/pub/ABexample.es

Good luck,
Michael

>I wonder if anyone can help. I'm trying to develop experiments
>where, on each trial I can present both a visual and an auditory
>stimulus. I know that this can be done as a SlideObject but,
>crucially, I need to vary the onset times of each stimulus
>separately so that: on some trials the auditory stimulus precedes
>the visual; on others they are presented simultaneously; and on yet
>others the visual stimulus precedes the auditory. Plainly I need to
>set up a number of variables but I can't seem to even get E-Prime
>to let me present two stimuli in the same trial but at different
>onsets.
>
>Thanks in anticipation,
>
>Roy Allen
>University of Aberdeen.


--
__
Michael Worden, PhD                miw2004 at med.cornell.edu
Sackler Institute for Developmental Psychobiology, Box 140
1300 York Ave., NY, NY 10021             Tel: 212 746-5830
http://www.sacklerinstitute.org