title: Self-face recognition shares brain regions active during proprioceptive illusion in the right inferior fronto-parietal superior longitudinal fasciculus III network.
abstract: Proprioception is somatic sensation that allows us to sense and recognize position, posture, and their changes in our body parts. It pertains directly to oneself and may contribute to bodily awareness. Likewise, one's face is a symbol of oneself, so that visual self-face recognition directly contributes to the awareness of self as distinct from others. Recently, we showed that right-hemispheric dominant activity in the inferior fronto-parietal cortices, which are connected by the inferior branch of the superior longitudinal fasciculus (SLF III), is associated with proprioceptive illusion (awareness), in concert with sensorimotor activity. Herein, we tested the hypothesis that visual self-face recognition shares brain regions active during proprioceptive illusion in the right inferior fronto-parietal SLF III network. We scanned brain activity using functional magnetic resonance imaging while twenty-two right-handed healthy adults performed two tasks. One was a proprioceptive illusion task, where blindfolded participants experienced a proprioceptive illusion of right hand movement. The other was a visual self-face recognition task, where the participants judged whether an observed face was their own. We examined whether the self-face recognition and the proprioceptive illusion commonly activated the inferior fronto-parietal cortices connected by the SLF III in a right-hemispheric dominant manner. Despite the difference in sensory modality and in the body parts involved in the two tasks, both tasks activated the right inferior fronto-parietal cortices, which are likely connected by the SLF III, in a right-side dominant manner. Here we discuss possible roles for right inferior fronto-parietal activity in bodily awareness and self-awareness.
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT), 1-4 Yamadaoka, Suita, Osaka 565-0871, Japan. Electronic address: morita@ams.eng.osaka-u.ac.jp.
authors.forename: Tomoyo
authors.initials: T
authors.lastname: Morita
authors.affiliation: Research Center for Child Mental Development, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan; Biomedical Imaging Research Center, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan. Electronic address: sdaisuke@med.kanazawa-u.ac.jp.
authors.forename: Daisuke N
authors.initials: DN
authors.lastname: Saito
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Faculty of Psychology, Doushisha University, 1-3 Tatara Miyakodani, Kyotanabe-shi, Kyoto 610-0394, Japan. Electronic address: ekk1001@mail2.doshisha.ac.jp.
authors.forename: Midori
authors.initials: M
authors.lastname: Ban
authors.affiliation: Research Center for Child Mental Development, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan; Biomedical Imaging Research Center, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan. Electronic address: kshimada@u-fukui.ac.jp.
authors.forename: Koji
authors.initials: K
authors.lastname: Shimada
authors.affiliation: Research Center for Child Mental Development, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan. Electronic address: yokamoto@u-fukui.ac.jp.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Okamoto
authors.affiliation: Research Center for Child Mental Development, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan; Biomedical Imaging Research Center, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan; Department of Neuropsychiatry, Faculty of Medical Sciences, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan. Electronic address: hirotaka@u-fukui.ac.jp.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Kosaka
authors.affiliation: Research Center for Child Mental Development, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan; Biomedical Imaging Research Center, University of Fukui, 23-3 Matuokashimoaizuki, Eiheiji, Yoshida, Fukui 910-1193, Japan. Electronic address: okazawa@u-fukui.ac.jp.
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Okazawa
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. Electronic address: asada@ams.eng.osaka-u.ac.jp.
authors.forename: Minoru
authors.initials: M
authors.lastname: Asada
authors.affiliation: Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT), 1-4 Yamadaoka, Suita, Osaka 565-0871, Japan; Graduate School of Frontier Biosciences and Medicine, Osaka University, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan. Electronic address: eiichi.naito@nict.go.jp.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Naito
mesh_terms: D000293:Adolescent; D000328:Adult; D001931:Brain Mapping; D000066499:Facial Recognition / Q000502:physiology*; D005260:Female; D005625:Frontal Lobe / Q000000981:diagnostic imaging / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000000981:diagnostic imaging / Q000502:physiology*; D010296:Parietal Lobe / Q000000981:diagnostic imaging; D011434:Proprioception / Q000502:physiology*; D055815:Young Adult
keywords: bodily awareness; proprioceptive illusion; right inferior fronto-parietal cortices; self-awareness; self-face recognition; superior longitudinal fasciculus