Dear Fabienne,
If you are unsure about the type of connection, you should turn your doubt into a model comparison problem and simply compare a model with lateral connections to a model with forward and backward connections between left and right M1.
Best wishes
Martin
On 18 May2015, at 15:37, Fabienne Jung <[log in to unmask]> wrote:
> Dear Martin,
>
> thank you for your response! For me, it just makes more sense, that there is no hierarchical connection between the motor cortices, before the go stimulus for a movement is presented. That's why I initially preferred a lateral connection in the A-matrix. Isn't this possible?
>
> Best
> Fabienne
>
> -----Ursprüngliche Nachricht-----
> Von: Martin Dietz [mailto:[log in to unmask]]
> Gesendet: Montag, 18. Mai 2015 15:21
> An: Fabienne Jung
> Cc: [log in to unmask]
> Betreff: Re: [SPM] DCM for ERPs: Specification of connections, neural model
>
> Dear Fabienne,
>
> In this case, you should simply specify a forward and a backward connection between left and right M1 in the A-matrices and specify the same connections in the B-matrix.
>
> Best wishes
> Martin
>
>
>
> On 18 May2015, at 15:09, Fabienne Jung <[log in to unmask]> wrote:
>
>> Dear all,
>>
>> I have a question regarding the specification of the connections in DCM for ERPs:
>>
>> is it possible to have a lateral connection between for example left M1 and right M1 that changes into a forward/ backward connection with stimulus presentation in the B-matrix? That means the B-effect is forward from right to left and backward from left to right?
>>
>> Thank you in advance!
>>
>> Best
>> Fabienne
>
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