Multisensory interplay can occur in areas that are commonly considered unisensory, such as planum temporale (PT). The roles of different afferents to PT in multisensory processing are not well understood. Using sub-millimeter fMRI at 7T, we compared laminar activity patterns across topographical subfields of PT under unimodal and multisensory stimuli. We found (1) anterior PT was activated more by auditory inputs and received feedback in superficial layers, likely coming from higher-order multimodal areas; (2) posterior PT was preferentially activated by visual inputs and received visual feedback in both superficial and deep layers, likely projected directly from the early visual cortex.
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