4.6 Article

Insular dichotomy in the implicit detection of emotions in human faces

期刊

CEREBRAL CORTEX
卷 32, 期 19, 页码 4215-4228

出版社

OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhab477

关键词

emotional faces; humans; insula; intracranial recordings; local field evoked potentials

资金

  1. LABEX CORTEX of Universite de Lyon [ANR11-LABX-0042, ANR-11-IDEX-0007]

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The functional roles of the posterior and anterior sections of the insula differ, with the posterior section mainly connected to somato-sensory and motor areas, and the anterior section connected to frontal, limbic, and cingulate regions. The posterior section responds equally to all types of faces, while the anterior section only responds to emotional faces. Both sections of the insula are activated in parallel via distinct functional routes.
The functional roles of the insula diverge between its posterior portion (PI), mainly connected with somato-sensory and motor areas, and its anterior section (AI) connected with the frontal, limbic, and cingulate regions. We report intracranial recordings of local field evoked potentials from PI, AI, and the visual fusiform gyrus to a full array of emotional faces including pain while the individuals' attention was diverted from emotions. The fusiform gyrus and PI responded equally to all types of faces, including neutrals. Conversely, the AI responded only to emotional faces, maximally to pain and fear, while remaining insensitive to neutrals. The two insular sectors reacted with almost identical latency suggesting their parallel initial activation via distinct functional routes. The consistent responses to all emotions, together with the absence of response to neutral faces, suggest that early responses in the AI reflect the immediate arousal value and behavioral relevance of emotional stimuli, which may be subserved by fast track routes conveying coarse-spatial-frequency information via the superior colliculus and dorsal pulvinar. Such responses precede the conscious detection of the stimulus' precise signification and valence, which need network interaction and information exchange with other brain areas, for which the AI is an essentialhub.

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