I don't know. There is no way for me to answer that. It depends on the signal-to-noise of each of the modalities. You'll probably have to experiment a bit

On 6/22/2019 8:08 AM, Matthieu Vanhoutte wrote:

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I effectively smoothed both modalities the same amount.

The question is whether I should or not smooth before calculating within-subject correlation?

Best, Matthieu

Le sam. 22 juin 2019 à 02:14, Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edumailto:DGREVE@mgh.harvard.edu> a écrit : 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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