title: Stimulus features coded by single neurons of a macaque body category selective patch.
abstract: Body category-selective regions of the primate temporal cortex respond to images of bodies, but it is unclear which fragments of such images drive single neurons' responses in these regions. Here we applied the Bubbles technique to the responses of single macaque middle superior temporal sulcus (midSTS) body patch neurons to reveal the image fragments the neurons respond to. We found that local image fragments such as extremities (limbs), curved boundaries, and parts of the torso drove the large majority of neurons. Bubbles revealed the whole body in only a few neurons. Neurons coded the features in a manner that was tolerant to translation and scale changes. Most image fragments were excitatory but for a few neurons both inhibitory and excitatory fragments (opponent coding) were present in the same image. The fragments we reveal here in the body patch with Bubbles differ from those suggested in previous studies of face-selective neurons in face patches. Together, our data indicate that the majority of body patch neurons respond to local image fragments that occur frequently, but not exclusively, in bodies, with a coding that is tolerant to translation and scale. Overall, the data suggest that the body category selectivity of the midSTS body patch depends more on the feature statistics of bodies (e.g., extensions occur more frequently in bodies) than on semantics (bodies as an abstract category).
authors.affiliation: Laboratorium voor Neuro- en Psychofysiologie, KU Leuven Medical School, 3000 Leuven, Belgium; Department of Cognitive Science and Psychology, New Bulgarian University, 1618 Sofia, Bulgaria;
authors.forename: Ivo D
authors.initials: ID
authors.lastname: Popivanov
authors.affiliation: Institute of Neuroscience and Psychology, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
authors.forename: Philippe G
authors.initials: PG
authors.lastname: Schyns
authors.affiliation: Laboratorium voor Neuro- en Psychofysiologie, KU Leuven Medical School, 3000 Leuven, Belgium; rufin.vogels@med.kuleuven.be.
authors.forename: Rufin
authors.initials: R
authors.lastname: Vogels
mesh_terms: D000818:Animals; D001931:Brain Mapping; D059907:Functional Neuroimaging; D018594:Human Body; D008253:Macaca mulatta / Q000502:physiology; D008279:Magnetic Resonance Imaging; D008297:Male; D009474:Neurons / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D013702:Temporal Lobe / Q000502:physiology*
keywords: body perception; body selective area; feature selectivity; inferior temporal cortex; macaque