Dear SPMers,
I wonder if some of you could help me with this.
I've got a block design with 8 cycles of 24s rest and 24s task (picture
naming), when I select fMRI model/specify design, I choose to specify the
design in scans, in my case the number of condition is 1, I specify the
vector of onset, and then SPM asks me to specify the "duration [s] (event =
0)", what is exactly this duration? How do I decide how long should it be?
Because varying it, the activation map changes a lot.
Thanks a lot,
Laura
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