The role of the amygdala in the perception of positive emotions: an "intensity detector"

被引:73
作者
Bonnet, Louise [1 ,2 ,3 ]
Comte, Alexandre [2 ,3 ]
Tatu, Laurent [1 ,2 ,3 ]
Millot, Jean-Louis [3 ]
Moulin, Thierry [1 ,2 ,3 ]
de Bustos, Elisabeth Medeiros [1 ,2 ,3 ]
机构
[1] Besancon Univ Hosp, Dept Neurol, F-25030 Besancon, France
[2] Besancon Univ Hosp, Dept Res Funct Imaging, CIC 808, F-25030 Besancon, France
[3] SFR FED 4234 UFC CHRU EFS, Lab Integrat & Clin Neurosci, EA 481, Besancon, France
来源
FRONTIERS IN BEHAVIORAL NEUROSCIENCE | 2015年 / 9卷
关键词
amygdala; emotion; IAPS; fMRI; electrodermal response; emotional intensity; SKIN-CONDUCTANCE; NEURAL REPRESENTATIONS; INDIVIDUAL RATINGS; PREFRONTAL CORTEX; AVERSIVE STIMULI; VISUAL-STIMULI; VALENCE; AROUSAL; FMRI; ACTIVATION;
D O I
10.3389/fnbeh.2015.00178
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
The specific role of the amygdala remains controversial even though the development of functional imaging techniques has established its implication in the emotional process. The aim of this study was to highlight the sensitivity of the amygdala to emotional intensity (arousal). We conducted an analysis of the modulation of amygdala activation according to variation in emotional intensity via an fMRI event-related protocol. Monitoring of electrodermal activity, a marker of psychophysiological emotional perception and a reflection of the activation of the autonomic nervous system, was carried out concurrently. Eighteen subjects (10 men; aged from 22 to 29 years) looked at emotionally positive photographs. We demonstrated that the left and right amygdalae were sensitive to changes in emotional intensity, activating more in response to stimuli with higher intensity. Furthermore, electrodermal responses were more frequent for the most intense stimuli, demonstrating the concomitant activation of the autonomic nervous system. These results highlight the sensitivity of the amygdala to the intensity of positively valenced visual stimuli, and in conjunction with results in the literature on negative emotions, reinforce the role of the amygdala in the perception of intensity.
引用
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页数:12
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