Dear All:
We have acquired fMRI data with an ER design task. The task displays a cue
on the screen for 1 s indicating the participants may win money if he/she
can press a button while a target box is displayed on the screen. The target
box will be displayed about 3 - 5 s after the cue disappeared. We predict
that the brain regions associated with motivation should be activation by
the cues.
At first, I analyzed fMRI data using ER design, i.e., using 0 as duration of
cue. The result is consistent with our prediction, i.e., activation in the
ventral striatum.
But, we believe that the the brain regions associated with motivation should
be activated during the entire period between onsets of cue and target. So,
I analyzed the fMRI data again using the interval between onsets of cues and
targets (3 - 5 s) as duration of cues. The result showed much greater and
more extensive activation than the first analysis.
I'm wondering if my second analysis is reasonable?
Best
Jiansong
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