negative values can be interpreted as inhibition. so if areas 1 and 2 are
connected a negative connection weight would mean that an increase in
activity in area 1 would be associated with a decrease in activity in area
2. The direction is what you specify in the connection matrix.
hth
darren
> -----Original Message-----
> From: SPM (Statistical Parametric Mapping)
> [mailto:[log in to unmask]] On Behalf Of Pia Rotshtein
> Sent: Monday, November 19, 2007 12:49 PM
> To: [log in to unmask]
> Subject: [SPM] negative rates in DCM
>
> Dear all,
>
> I am trying to understand what the meaning of negative
> connection rate is?
>
> Do negative rates estimated for intrinsic connections mean inhibition?
>
> Do negative rates estimated for modulatory connections mean
> inhibition? Does interpretation of the direction of the
> modulatory rates depend on the direction of intrinsic connections?
>
>
>
> Any thought will be appreciated
>
>
>
> Thanks
>
>
>
> Pia
>
>
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