Developmental Ethology and Cognitive Psychology Group, Centre des Sciences du Goût et de l'Alimentation, UMR 6265 CNRS-Université Bourgogne Franche-Comté-Inrae-AgroSup, Dijon, France.
Developmental Ethology and Cognitive Psychology Group, Centre des Sciences du Goût et de l'Alimentation, UMR 6265 CNRS-Université Bourgogne Franche-Comté-Inrae-AgroSup, Dijon, France.
Biol Psychol. 2021 Jan;158:108005. doi: 10.1016/j.biopsycho.2020.108005. Epub 2020 Dec 5.
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.
气味效价对面部表情感知的影响尚不清楚。在这里，在 18 名参与者呈现表情面孔时，扩散了三种“效价”气味环境（愉快、不愉快、对照），同时记录头皮脑电图（EEG）。每 6 张面孔就会反复出现一种面部表情（快乐、厌恶或中性），以将其与 EEG 频谱中的 1 Hz 和谐波中的其他表情区分开来。与对照气味环境相比，中性气味在愉快气味环境中引起的大脑反应幅度更大，而不愉快气味环境中响应的电极较少。在两种气味环境中，厌恶的反应电极数量都减少了。在气味条件之间，对快乐面部表情的反应保持不变。总的来说，这些观察结果表明，效价气味会根据面部表情和气味的愉悦效价影响面部表情的神经辨别，特别是对于情感上模棱两可的中性表情。
