Dear All,
I have read over many of the posts here about how to execute time derivative models, but I have a few further questions.
1. My understanding of finding activity for the time derivative is that this activity reflects regions where the peak of the hrf occurs approximately 1 sec either before or after the canonical hrf (depending on whether the contrast weight is positive or negative). Is that an appropriate interpretation?
2. If we use a time derivative model, what does one usually report? Just activity associated with the time derivative? Activity associated with the hrf as well?
Thank you,
Caitlin
Caitlin Bowman
Graduate Student
Cognitive Psychology
The Pennsylvania State University
441 Moore Building
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