Hi John,

you would use a sine and cos at the fundamental. Unfortunately, our retinotopy analysis is rather finnicky about the data formats and directory structure, so you might want to use the FreeSurfer functional analysis tools. It's on my list to generalize it ...

doug

McLean John (NHS Greater Glasgow & Clyde) wrote:

Hi,

I am hoping to perform a retinotopic mapping fMRI study.

My paradigms consist of a reversing checkerboard annulus which increases and decreases in size and a reversing checkerboard wedge which moves clockwise dor 180 degrees and then anticlockwise.

I am struggling to correctly perform the fMRI analysis. I hope to use FSL so that i can then overlay the functional data on the flattened visual cortex using freesurfer.

My problem is that i do not know how to correctly model the fMRI data using FSL, i believe i should use a sinusoid model but i am unsure of how to proceed.

Would anyone with experience in this area be willing to discuss these issues with me?

Thanks for your help,

John

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