Sphericity correction

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AFNI version info (afni -ver):
Precompiled binary linux_rocky_8: Feb 15 2024 (Version AFNI_24.0.07 'Caracalla')

Dear Colleagues,

Hi. Does the sphericity correction in 3dMVM use the Greenhouse-Geisser correction?

Sincerely,

Dante

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Dante,

3dMVM includes both Greenhouse-Geisser and Hyunh-Feldt corrections. The selection between the two methods is determined based on the Huynh-Feldt epsilon. If the epsilon value is below 0.75, the Greenhouse-Geisser correction is applied; otherwise, the Hyunh-Feldt correction is adopted.

Gang Chen

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Thanks!