Problem

[Susan Campbell]

One thing to try, if you haven't already, is creating two (or three)
seperate Procedure objects, one with the sound first and one with the
visual first.  Then you can vary which Procedure you use from the list
that controls presentation and duration, though you might need to rework
your duration math a little.

You can probably even use the same sound and visual display objects in
both procedures to minimize the number of different objects required
(though I suppose you'd need to use a combined slide for the
simultaneous condition).  This worked for me on an experiment that
involved having two visual presentations per trial whose order varied
between trials, so I assume it would work for a combination of visual
and auditory stimuli.

There may be other solutions, however.  I haven't done much with the new
SlideObject, so I'm not sure what its capabilities are.

Hope this helps,
Susan Campbell
STEP E-Prime Programmer

Roy Allen wrote:

> 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.
>
>