Odor-evoked hedonic contexts influence the discrimination of facial expressions in the human brain - Archive ouverte HAL Access content directly
Journal Articles Biological Psychology Year : 2021

Odor-evoked hedonic contexts influence the discrimination of facial expressions in the human brain

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Abstract

The influence of odor valence on expressive-face perception remains unclear. Here, three "valenced" odor contexts (pleasant, unpleasant, control) were diffused while scalp electroencephalogram (EEG) was recorded in 18 participants presented with expressive faces alternating at a 6-Hz rate. One facial expression (happiness, disgust or neutrality) repeatedly arose every 6 face pictures to isolate its discrimination from other expressions at 1 Hz and harmonics in the EEG spectrum. The amplitude of the brain response to neutrality was larger in the pleasant vs. control odor context, and fewer electrodes responded in the unpleasant odor context. The number of responding electrodes was reduced for disgust in both odor contexts. The response to happiness was unchanged between odor conditions. Overall, these observations suggest that valenced odors influence the neural discrimination of facial expressions depending on both face and odor hedonic valence, especially for the emotionally ambiguous neutral expression.
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Dates and versions

hal-03077913 , version 1 (02-01-2023)

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Attribution - NonCommercial - NoDerivatives - CC BY 4.0

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Fanny Poncet, Arnaud Leleu, Diane Rekow, Fabrice Damon, Karine Durand, et al.. Odor-evoked hedonic contexts influence the discrimination of facial expressions in the human brain. Biological Psychology, 2021, 158, pp.108005. ⟨10.1016/j.biopsycho.2020.108005⟩. ⟨hal-03077913⟩
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