Re: [Freesurfer] Within-subject vertexwise correlation

[Greve, Douglas N.,Ph.D.]

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. 
mailto:dgr...@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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Re: [Freesurfer] Within-subject vertexwise correlation

[Matthieu Vanhoutte]

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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. <
dgr...@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:
>
> External Email - Use Caution
> 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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> Freesurfer mailing 
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>
>
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Re: [Freesurfer] Within-subject vertexwise correlation

[Greve, Douglas N.,Ph.D.]

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:

External Email - Use Caution

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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[Freesurfer] Within-subject vertexwise correlation

[Matthieu Vanhoutte]

External Email - Use Caution

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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