Question about how to set a paradigm of different onset primes?

[Stephen Lai]

Hi,
I am currently now developing a cross-modal priming paradigm ( image
(prime) -- autitory (target)).
I want to set up two conditions:
(1). Stimulus onset= 0msec; that is, the prime and the target appear
simultaneously, but I just want the prime to appear for 300 msec...
This cannot be done in a "Slide" since I cannot control the duration of the
image.  So, how can I do this without using a "Slide"?

Actually, I have no idea about how to set different onset conditions. For
example, I want the prime to appear simultaneously with the target..
or let the prime to appear around the middle or the late part of the
target.....

Can anyohe help me ?

Stephen Lai
 Stephen Y.D. Lai
 Graduate Institute of Linguistics
 National Chung Cheng University
 Min-Hsiung, Chia-Yi  621
 TAIWAN, ROC
 Email:  g8915013 at ccunix.ccu.edu.tw