Dual Task (One is experimenter-paced, the other is participant-paced)

[Khu]

Hi,

I'm trying to program a dual task in which participants are presented with 
a series of pictures that appear for 3 seconds each. At the same time, they 
are completing a secondary letter detection task in which they hear 
different letters of the alphabet and must enter a corresponding key. I 
want this secondary task to be participant-paced meaning that the next 
letter is presented after they enter a response. Also, I want the program 
to exit as soon as 10 pictures appear whether or not the letter detection 
task is done. 

I've downloaded the dual task example on pstnet support but it does not 
appear to work the way I want it to. Specifically, the pictures change 
every time I enter a response for the secondary task rather than after 
every 3 seconds. I guess the difference between my experiment and the 
example is that both of the tasks in the example are experimenter-paced 
whereas in my experiment, one is experimenter-paced and one is 
participant-paced. Any help would be greatly appreciated! Thanks! 

Khuyen

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