Marc Ettlinger wrote:

> Dear Ziad,
>
> Thanks kindly for your response.
>
> To confirm, using tent will ultimately give me the HRF
> beginning at the time specified in stim_times.
If the 'b' parameter for tent is 0 then yes.

So, if I want to
> treat the times in stim_times as the beginning of 4 sec blocks
> and extract the HRF from the end of these blocks, I need to
> either add 4 to the times in the stim_times files,
You should not skip modeling the first part.
or ignore
> the first 2 TR (TR=2sec) in the HRF time series output and make
> it longer to capture the duration I want.
You should model the response from the time it is expected to begin until the time it is expected to end. Choose whatever portion you want afterward from iresp output.
>
> Does that sound right?
>
> Also, do you know if there is a way to combine conditions via
> -iresp?
I do not know what you mean by that.
>
> Thanks,
> Marc