The analysis is done by creating two regressors: a sine and cosine, both at the stimulation frequency. Each has a regression coefficient computed (ie, a 'beta'). The p-value is computed from an F-test on these two betas.

doug

Thomas Janssens wrote:

Hi,

I performed a retinotopy analyses with freesurfer using selxavg3-sess. One of the nii-files that is created with this command is sig.nii. How is the significance map in sig.nii calculated for retinotopy? which p-values are used in this calculation?

Thanks!

Thomas

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