I'm not sure that this is a question we can answer. If you do smooth, then you should smooth both modalities the same amount.

On 6/18/2019 10:12 PM, Matthieu Vanhoutte wrote:

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Dear FS experts,

I would like to compute within-subject correlation between two modalities based on vertexwise maps in fsaverage space. I wonder whether I have to smooth the normalized surface-based maps before computing vertexwise within-subject correlation?

I have noted that smoothing surface maps before computing correlation increases the output correlation value.

Thanks for your lights.

Best,

Matthieu

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