Investigating somatotopy in SI and SII with high resolution multiband fMRI at 7T

By using multiband acquisition to extend slice coverage, we investigate body somatotopy in SI and SII with high spatial resolution at 7T. fMRI was performed during both fingertip and face-hand-foot mapping paradigms in three subjects. The fingertip mapping paradigm revealed clear digit somatotopic representation within SI, but not in SII for all subjects, suggesting an overlapping representations of the fingers in SII. The face-hand-foot mapping showed a somatotopic arrangement in SII, with the representation of the face, hand and foot ordered from lateral to medial, in agreement with previous fMRI experiments and electrophysiology in primates.

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