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Previous studies of tactile responses in MT+ and LO have used only hand
stimulation. To search for somatotopy in lateral occipital temporal cortex, we
constructed individual and group maps of the contrast of contralateral hand versus
contralateral foot stimulation (Fig. 4). The parietal operculum contained regions
responsive to hand and foot stimulation organized in a mirror-symmetric manner,
corresponding to the expected Somatotopic organization of multiple representations of
the body surface (Disbrow, et al. 2000; Eickhoff, et al. 2007). We did not observe
Somatotopic organization in MST. Most MST voxels preferred hand stimulation or
showed no significant preference. We quantified the lack of somatotopy in MT+ as
follows. If an area is somatotopic, there should be a spatial segrégation between voxels
that respond to hand stimulation and voxels that respond to foot stimulation.
Mathematically, this can be quantified as the ratio between the number of voxels that
respond to both hand and foot stimulation and the number of voxels that respond to
either hand or foot stimulation. We calculated a relatively high ratio of 0.24 for MT+,
indicating weak somatotopy (Young, et al. 2004).

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