title: Rapid, high-frequency, and theta-coupled gamma oscillations in the inferior occipital gyrus during face processing.
abstract: Neuroimaging studies have found greater activation in the inferior occipital gyrus (IOG), or occipital face area, in response to faces relative to non-facial stimuli. However, the temporal, frequency, and functional profiles of IOG activity during face processing remain unclear. Here, this issue was investigated by recording intracranial field potentials in the IOG during the presentation of faces, mosaics, and houses in upright and inverted orientations. Time-frequency statistical parametric mapping analyses revealed greater gamma-band activation in the IOG beginning at 110 msec and covering 40-300 Hz in response to upright faces relative to upright houses and mosaics. Phase-amplitude cross-frequency coupling analyses revealed more evident theta-gamma couplings at 115-256 msec during the processing of upright faces as compared with that of upright houses and mosaics. Comparable gamma-band activity was observed during the processing of inverted and upright faces at about 100-200 msec, but weaker activity and different coupling with theta-band activity after 200 msec. These patterns of activity were more evident in the right than in the left IOG. These results, together with other evidence on neural communication, suggest that broadband gamma oscillations in the right IOG conduct rapid and multistage (i.e., both featural and configural) face processing in collaboration with theta oscillations transmitted from other brain regions.
authors.affiliation: The Hakubi Project, Primate Research Institute, Kyoto University, Japan; The Organization for Promoting Research in Developmental Disorders, Japan. Electronic address: sato.wataru.4v@kyoto-u.ac.jp.
authors.forename: Wataru
authors.initials: W
authors.lastname: Sato
authors.affiliation: The Hakubi Project, Primate Research Institute, Kyoto University, Japan.
authors.forename: Takanori
authors.initials: T
authors.lastname: Kochiyama
authors.affiliation: Faculty of Human Health Science, Kyoto University, Japan.
authors.forename: Shota
authors.initials: S
authors.lastname: Uono
authors.affiliation: National Epilepsy Center, Shizuoka Institute of Epilepsy and Neurological Disorders, Japan.
authors.forename: Kazumi
authors.initials: K
authors.lastname: Matsuda
authors.affiliation: National Epilepsy Center, Shizuoka Institute of Epilepsy and Neurological Disorders, Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Usui
authors.affiliation: National Epilepsy Center, Shizuoka Institute of Epilepsy and Neurological Disorders, Japan.
authors.forename: Yushi
authors.initials: Y
authors.lastname: Inoue
authors.affiliation: The Organization for Promoting Research in Developmental Disorders, Japan; Faculty of Human Health Science, Kyoto University, Japan.
authors.forename: Motomi
authors.initials: M
authors.lastname: Toichi
mesh_terms: D000328:Adult; D001931:Brain Mapping; D058256:Brain Waves / Q000502:physiology*; D004569:Electroencephalography; D005145:Face; D005149:Facial Expression; D005260:Female; D006801:Humans; D008297:Male; D009778:Occipital Lobe / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D014796:Visual Perception / Q000502:physiology*
keywords: Face; Gamma oscillation; Inferior occipital gyrus; Intracranial field potential recording; Phase–amplitude cross-frequency coupling