Correlational Tractography: Number of streamline is the magnitude of relevance?

[高橋航来]

Dear Frank and all, 

You may sometimes want to perform correlational tractography analysis for individual items of the same battery or same group of metrics.

In our case, we performed CT for 6 items of the rhythm ability battery to see if 

①there is relationships between white matter microstructure and rhythm ability

and

②there is common and distinct white matter tracts correlated with each item.

Regarding ②, we found that the same group of tracts were correlated for almost all groups, but the number of streamlines were very different (e.g., 50000 in one item and 50 in another).

In this case, is the number of streamlines a evidence of the magnitude of the relevance between certain white matter tracts and metrics of interest?

I appreciate your continuous support for the community.

Sincerely,

Koki

[Frank Yeh]

I would use 'volume' to quantify the 'magnitude of the relevance' here.
Although 'volume' is mostly correlated with 'tract counts', sometimes
they may not correlate perfectly.

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