title: Intermixed structure of voxels with different hemispheric characteristics in the fusiform face area.
abstract: The fusiform face area, a high-level visual area, is pivotal in processing facial information. This area receives inputs from the left and right visual fields unlike the primary visual area, which only receives inputs from its contralateral visual field. Response of the fusiform face area to ipsilateral stimulation depends on the signals crossing over at the corpus callosum. We investigated the distribution of voxel-wise activation to determine whether ipsilateral-dominant voxels exist in the fusiform face area using high spatial resolution functional MRI at 7 T. We further examined the possible functional differences between ipsilateral-dominant and contralateral-dominant voxels. By unilateral visual field stimulation, we detected ipsilateral-dominant voxels in the right fusiform face area. Their distribution was spatially heterogeneous. We tested upright and inverted facial stimulation confined to unilateral visual fields and found that these ipsilateral-dominant voxels had a different functional nature from contralateral-dominant voxels.
authors.affiliation: Neuroscience Research Institute, Gachon University, Incheon, South Korea.
authors.forename: Uk-Su
authors.initials: US
authors.lastname: Choi
authors.forename: Yul-Wan
authors.initials: YW
authors.lastname: Sung
authors.forename: Sang-Han
authors.initials: SH
authors.lastname: Choi
authors.forename: Nambeom
authors.initials: N
authors.lastname: Kim
authors.forename: Young-Bo
authors.initials: YB
authors.lastname: Kim
authors.forename: Zang-Hee
authors.initials: ZH
authors.lastname: Cho
authors.forename: Seiji
authors.initials: S
authors.lastname: Ogawa
mesh_terms: D000328:Adult; D001931:Brain Mapping / Q000379:methods; D003337:Corpus Callosum / Q000502:physiology*; D005145:Face / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D014793:Visual Cortex / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology; D055815:Young Adult