Authors:
Ogawa K, Imamizu H.
Title:
Human sensorimotor cortex represents conflicting visuomotor mappings.
Journal(書誌情報）:
The Journal of Neuroscience
doi:
10.1523/JNEUROSCI.4661-12.2013
論文URL:
http://www.jneurosci.org/content/33/15/6412.long
Abstract:
Behavioral studies have shown that humans can adapt to conflicting
sensorimotor mappings that cause interference after intensive
training. While previous research works indicate the involvement of
distinct brain regions for different types of motor learning (e.g.,
kinematics vs dynamics), the neural mechanisms underlying joint
adaptation to conflicting mappings within the same type of
perturbation (e.g., different angles of visuomotor rotation) remain
unclear. To reveal the neural substrates that represent multiple
sensorimotor mappings, we examined whether different mappings could be
classified with multivoxel activity patterns of functional magnetic
resonance imaging data. Participants simultaneously adapted to
opposite rotational perturbations (+90° and － 90°) during visuomotor
tracking. To dissociate differences in movement kinematics with
rotation types, we used two distinct patterns of target motion and
tested generalization of the classifier between different combinations
of rotation and motion types. Results showed that the rotation types
were classified significantly above chance using activities in the
primary sensorimotor cortex and the supplementary motor area, despite
no significant difference in averaged signal amplitudes within the
region. In contrast, low-level sensorimotor components, including
tracking error and movement speed, were best classified using
activities of the early visual cortex. Our results reveal that the
sensorimotor cortex represents different visuomotor mappings, which
permits joint learning and switching between conflicting sensorimotor
skills.
著者Contact先の email: k.ogawa@atr.jp
日本語によるコメント
行動実験から，ヒトは干渉のある複数の視覚運動変換に同時適応が可能な点が示
唆されている．本研究は，複数の感覚運動マッピングを表象する神経表象をfMRI
で明らかにした．実験参加者は視覚トラッキング課題において，２種類の相反す
る回転変換（＋90度または－90度）に同時適応した．適応後に運動中のfMRI活動
に対してマルチボクセルパターン分析法を用い，２つの変換条件が識別可能かを
検討した．結果から，感覚運動野の活動パターンを使って回転変換の識別が可能
であり，ヒト感覚運動野で複数の感覚運動マッピングが表象されていることが明
らかとなった．
