varying interstimulus interval based on scanner pulse

[David Hairston]

If you're already familiar with doing Inline scripts....

I'd just use an Inline script to keep track of how many times it has
been triggered.

 

Maybe each time it receives a trigger, have some dummy variable
incremented by 1

Then check it, if < the critical amount, send it back to a label....

 

e.g. If Trigger < X then Goto Label 1

 

 

________________________________

From: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] On
Behalf Of Binyam Nardos
Sent: Monday, October 01, 2007 5:37 PM
To: eprime at mail.talkbank.org
Subject: varying interstimulus interval based on scanner pulse

 

Fellow eprimers,
I have an experiment designed to display about 30 target stimuli
separated by varying interstimulus intervals. Since this is an
in-scanner experiment, I have an inline code which enables my experiment
to listen to a scanner pulse and execute certain actions (such as end
the duration of a stimulus or an interstimulus interval). Now what I'm
trying to achieve is that instead of programming my interstimuls
intervals to last for a given duration based on computer time ... I want
them to last for an x number of scanner pulses ...  so instead of
terminating a the interstimulus interval at the first instance of a
pulse ...  it would terminate it on the second third or fourth etc ..
instances of a pulse.

Any help would be appreciated ..

Binyam

Binyam Nardos
Cognitive Rehabilitation Research Group
Washington University School of Medicine Box # 8505
4444 Forest Park Blvd
St. Louis, MO 63108
Office: (314) 454-7795
Fax: (314) 286-1601



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