The HRF function is the same length; changing the duration changes the
length of the stimulus. When stimuli of different durations are
convolved with a canonical HRF, the resulting predicted response
differs in both duration and overall magnitude (up to a certain
point). The Griband article Jason referred to
others---show examples of this. Hope this clarifies a bit.
On Thu, Mar 26, 2009 at 5:38 PM, Dorian P. <[log in to unmask]> wrote:
> Related to Micheal answer, I thought different durations change the
> length of the HRF function, thus the only difference with 0 duration
> should be how lond does the peak last. Am I missing something?