Hi,
I try to specify the following basic DCM model: two types of stimuli circles
and squares. I am interested to know what happens to connection between V1
and V2 as a result of switching from circles to squares and visa versa.
Intrinsic connection is simple to define (V1 to V2). But what how I define
external inputs and modulations? In Friston classic attention example, there
was a modulation, which is unrelated to stimulus change. And he didn't
define external input in attention modulation (Why? there was still a visual
input). What I do in my case? My conditions are similar.
Thanks a lot for your help,
John
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