Hi,
If you think there could be any difference in brain activity in the instruction 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 00:55, Jie Yu <[log in to unmask]> wrote:
> Hi
> I am doing a block design FEAT analysis.
> There is an instruction period in the block.
> Is it necessary to crease an EV for that instruction period? (I am not interested in the instruction period…)
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