2013年8月20日火曜日

Laterality Effect for Faces in Chimpanzees (Pan troglodytes)

Christoph D. Dahl, Malte J. Rasch, Masaki Tomonaga, and Ikuma Adachi
J. Neurosci. 2013;33 13344-13349
http://www.jneurosci.org/cgi/content/abstract/33/33/13344?etoc

チンパンジーも、ヒトと同様に、脳の右半球を使って他者の顔を認知している。

・他者を同定するのに「他者の顔の左半分の情報」を主に用いている
・「他者の顔の左半分の情報」は「自分の脳の右半球」に入る(視覚経路は交叉しているので)
→ 脳の右半球を使って他者の顔を認知している
というロジック。

Face perception in humans is governed more by right-hemispheric than left-hemispheric neural correlate. Some but not all neurophysiological studies depict a right-side dominance for face responsive neurons in the brains of macaques. Hence, it is an open question whether and to what extent a right-hemisphere preference of processing faces exists across primate brains. We investigated chimpanzees discriminating chimeric faces of chimpanzees and humans, i.e., the combination of either left or right sides of a face vertically flipped and merged into a whole face. We found an effect of choosing the left-chimeric face more often than the right-chimeric face as being the one of the two that is closer to the original face, reflecting an advantage for the right side of the brain to process faces, as reported in humans. Moreover, we found a modulation by age of the participants, suggesting that the exposure history with a particular category shapes the right-hemispheric neural correlate to a configural/holistic processing strategy. In other words, the findings in chimpanzee participants parallel those in human participants and are suggestive for similar neural machineries in the occipital-temporal cortices in both species.

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