programing problem

[wangmo at bgnet.bgsu.edu]

Hi, hope someone can help me solve the problem.

In my study, I have two stimuli.  One is a visual stimulus, the other is
a auditory stimulus.  For each trial, either visual or auditory stimulus
will be presented first and last for a while (for example, 12 seconds).
After 4 seconds the first stimulus emerges, the other stimulus will be
presented and also last for a while (for example, 4 seconds or 12
seconds).  So there would be a duration that at the same time both
stimuli exist.  Then, one of them will disappear, and the participants
are supposed to respond to the remain stimulus.

With e-prime, I have difficult to make this paradigm to work.  When I
insert the second stimulus, the first stimulus will be terminated.  How
can I make it work?

Thank you!

-Mo