varying lengths of exposure based on responses

[Scott Moeller]

Dear Colleagues,

I'm fairly new to using e-prime, and I'm hoping someone can help me out 
with a question.

A somewhat recent paper (Aharon et al., 2001) describes a task in which 
participants are exposed to faces.  The catch is that participants 
could vary the amount of exposure they had to these faces by their 
responses.  The default length of exposure was 8s.  If they wanted the 
faces to disappear faster, they could alternate pressing the "z" and 
"x" keys.  However, if they wanted the pictures to remain on the screen 
for longer than 8s, they could alternate pressing the "n" and "m" keys.

The authors used Authorware (Macromedia) for this task.  I was 
wondering if a similar task could be performed using e-prime.

Thank you for your time!

Best regards,

Scott Moeller
University of Michigan