Stimulus representations in body-selective regions of the macaque cortex assessed with event-related fMRI

NeuroImage
Ivo D PopivanovRufin Vogels

Abstract

Functional imaging studies in humans and monkeys have shown category-selective regions in the temporal cortex, in particular for faces and bodies. Although the body-selective regions have been well studied in humans, little is understood about the functional properties of such regions in macaques. To address this, we first mapped body-selective activations in the visual cortex of four rhesus monkeys in a block design fMRI study and identified two regions in the middle and anterior Superior Temporal Sulcus (STS) that were more strongly activated by monkey bodies compared to well-controlled manmade objects. These two regions partially overlapped with regions that were more activated by faces than manmade objects. Secondly, using an event-related, single image fMRI design we measured the activations to 200 images of 10 stimulus classes (monkey bodies, human bodies, mammals, birds, monkey faces, human faces, body-like sculptures, fruits/vegetables, and two sets of control objects). Multivoxel-pattern analyses showed that both body-selective regions primarily distinguished faces from other inanimate and animate objects, including bodies. Another distinction was present between inanimate objects and bodies in the middle STS body regi...Continue Reading

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