Hi Devdutta,

I'm fairly certain (i.e. correct me if I'm wrong people) that this average brain looks correct. Some of the gyri and sulci are more pronounced on the group inflated cortex than on the individuals, because in the averaging process these are more consistent across participants (like the central sulcus for example). If you load the curvature and binarize it, you will see what looks like a normal brain, but with much fewer gyri and sulci (due to gyri and sulci not matching across brains, from the normal intersubject variability). You can also check this by loading up the labels for the group participant

As to your second question, this is a common bug experienced on many systems. Freesurfer has a few implemented techniques to deal with this without changing your image i.e. rotating etc..

The simplest is just right clicking the image. Next there is the refresh button on the toolbar.

There is also a setting you can change to have the windows refresh more frequently, but this is very costly in computing power.

Dan

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Today's Topics:

1. Re: Freesurfer visuals (Devdutta W)

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Message: 1 Date: Tue, 17 Feb 2009 11:44:05 -0600 From: Devdutta W devdutta.w@gmail.com Subject: [Freesurfer] Re: Freesurfer visuals To: Freesurfer Mailing List freesurfer@nmr.mgh.harvard.edu Message-ID: 95b61cf50902170944u29ba6278nf4e16822af92916@mail.gmail.com Content-Type: text/plain; charset="iso-8859-1"

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