title: Parietal and frontal object areas underlie perception of object orientation in depth.
abstract: Recent studies have shown that the human parietal and frontal cortices are involved in object image perception. We hypothesized that the parietal/frontal object areas play a role in differentiating the orientations (i.e., views) of an object. By using functional magnetic resonance imaging, we compared brain activations while human observers differentiated between two object images in depth-orientation (orientation task) and activations while they differentiated the images in object identity (identity task). The left intraparietal area, right angular gyrus, and right inferior frontal areas were activated more for the orientation task than for the identity task. The occipitotemporal object areas, however, were activated equally for the two tasks. No region showed greater activation for the identity task. These results suggested that the parietal/frontal object areas encode view-dependent visual features and underlie object orientation perception.
authors.affiliation: Research Center for Advanced Science and Technology, Laboratory for Cognitive Sciences, The University of Tokyo, Bldg 13, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan. niimi@L.u-tokyo.ac.jp
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Niimi
authors.forename: Ayako
authors.initials: A
authors.lastname: Saneyoshi
authors.forename: Reiko
authors.initials: R
authors.lastname: Abe
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Kaminaga
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Yokosawa
mesh_terms: D001931:Brain Mapping; D003867:Depth Perception / Q000502:physiology*; D005625:Frontal Lobe / Q000098:blood supply / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D009949:Orientation / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D010296:Parietal Lobe / Q000098:blood supply / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D055815:Young Adult
chemical_list: D010100:Oxygen