Hi,
If you think there could be any difference in brain activity in the fixation period (e.g. visual, attention, listening, reading, cognition) then you should model this as a separate EV, but don't include the EV in the contrast of interest.
All the best,
Mark
On 31 May 2014, at 10:17, Jie Yu <[log in to unmask]> wrote:
> Hi
>
> I wonder if I need to create EV in FEAT for the "crosshair fixation period" in my block design study?
>
> There is a 8 second crosshair period and 4 second instruction period in every block of my study…
>
> Can I just ignore them or should I create separate EVs for them?
>
> Thanks!
|