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Hi Dina,

Perhaps consider adjusting window and number so that there is one impulse per TR during the period that you expect the HRF to be off its baseline. I'd leave phase as 0, unless you'd like to reduce the number of EVs slightly by skipping the very beginning of the BOLD response.

All the best,

Anderson


On 15 November 2017 at 16:38, Dina Dajani <[log in to unmask]> wrote:
Hi FSL experts,

I am using feat to model two events in my event-related design using a FIR model (I plan to extract width and onset latency metrics for these two event types). Event durations are 8s, and ISIs are jittered [2-12s, average length 5s]. What is the best way to choose the phase, number, and window parameters for the FIR model?

Thank you,

Dina Dajani