title: Involvement of low-level visual areas in hemispheric superiority for face processing.
abstract: Previous studies on laterality in face processing have indicated superiority of the right hemisphere in discriminating and recognizing faces; however, the reasons for this feature are poorly understood. We employed functional MRI (fMRI) to elucidate the origin of this feature and used a paired-stimulus paradigm in which face pairs were presented unilaterally at the left or right visual hemifield of the participants. Each face in a pair was at a different position in the visual field. Refractory suppression in the fMRI response was observed bilaterally at the fusiform face area (FFA) for the same face pairs when pictures were presented in the left visual hemifield. In contrast, suppression was observed bilaterally at the FFA for the different as well as for the same face pairs when pictures were presented in the right visual hemifield. This pattern indicated inferior discrimination ability for paired stimuli presented to the right visual hemifield. These observations, along with changes in bilaterally interlocked responses at the FFA, suggest that low-level visual areas, and not high-level face areas, are strongly associated with the superiority of the right hemisphere in face processing.
authors: Kansei Fukushi Research Institute, Tohoku Fukushi University, Sendai, Japan; Center for Advanced Research for Logic and Sensibility, Keio University, Tokyo, Japan. sungstone@gmail.com
authors: Yul-Wan
authors: YW
authors: Sung
authors: Yoshiaki
authors: Y
authors: Someya
authors: Yamamoto
authors: Y
authors: Eriko
authors: Sang-Han
authors: SH
authors: Choi
authors: Zang-Hee
authors: ZH
authors: Cho
authors: Seiji
authors: S
authors: Ogawa
mesh_terms: D005145:Face; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D010775:Photic Stimulation / Q000379:methods*; D021641:Recognition, Psychology / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*