Problem

[Susan Campbell]

As an addendum, the experiment I mentioned is a replication of the
Eriksen and St. James (1986) study of focal attention.  In some cases,
positions in a display are cued before the display appears, and in other
cases, after.  The experiment is online at:

http://step.psy.cmu.edu/scripts/Eriksen1986.zip

Have a nice day,
Susan

Susan Campbell wrote:

> 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.
>>
>>
>
>
>