Hi Wolff
an ROI can be sigificantly different without any individual vertex being
significant. It means the vertex measures are noisy in all likelihood, but
the noise averages out in the larger number of measurements.
cheers
Bruce
On Mon, 11 Feb 2013, Wolff
Schlotz wrote:
Dear Anderson
Very helpful, great, many thanks!
Best,
Wolff
Anderson M. Winkler wink...@fmrib.ox.ac.uk 11.02.2013 15:57
Dear Wolff,
Compared to vertexwise, analysis of regions (ROIs) have different features. If
the area of true signal spans the whole region, or large parts of it, then an
ROI analysis
Dear Wolff,
Compared to vertexwise, analysis of regions (ROIs) have different features.
If the area of true signal spans the whole region, or large parts of it,
then an ROI analysis tend to be more powerful as the noise is diluted when
the vertices that comprise the ROI are summed or averaged.
