On 04/10/2012 09:40 AM, Greg Burgess wrote:

HI freesurfers,

I have a few questions that were asked previously, but I don't seem to be able to find (or possibly understand) the answers.

1. I'm displaying polar and eccentricity maps using the rtview script. However, no color wheel appears, and I do not seem to be able to find an option to display it in the tksurfer menus. What colors correspond to the horizontal and vertical meridia? Is there a way to display the color wheel as a legend?

Actually, I don't know myself. That code was written a long time ago, and I'd have to dig deep into it.

2. If, instead of using rtview, I display the heat maps in tksurfer, how do I know what values correspond to the horizontal and vertical meridia?

Aren't the meridia supposed to have an of 0? If so, then when the maps transitions from red to blue should be the meridian.

3. My fieldsign maps appear very speckled, like red and blue polka dots across all of cortex. However, as far as I can determine, the polar and eccentricity maps look reasonable. As suggested elsewhere, I've applied various amounts of smoothing in the fieldsign-sess call. More smoothing makes it look better, but even with 10mm of smoothing, it's unclear if the fieldsigns are correct. How can I track down the problems with the fieldsign maps?

It's hard to say. Can you send pics? What smoothing levels are you using? Have you verified that the functional-structural registrations look ok?

doug

Thanks in advance! --Greg

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Greg Burgess, Ph.D. Staff Scientist, Human Connectome Project Washington University School of Medicine Department of Anatomy and Neurobiology Email: burgessg@pcg.wustl.edu

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