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青少年期对情绪刺激易感性增强的脑电图振荡证据

EEG Oscillation Evidences of Enhanced Susceptibility to Emotional Stimuli during Adolescence.

作者信息

Meng Xianxin, Liu Wenwen, Zhang Ling, Li Xiang, Yao Bo, Ding Xinsheng, Yuan JiaJin, Yang Jiemin

机构信息

Faculty of Psychology, Southwest UniversityChongqing, China; School of Education, Nanyang Normal UniversityNanyang, China.

School of Education, Nanyang Normal University Nanyang, China.

出版信息

Front Psychol. 2016 May 18;7:616. doi: 10.3389/fpsyg.2016.00616. eCollection 2016.

Abstract

BACKGROUND

Our recent event-related potential (ERP) study showed that adolescents are more emotionally sensitive to negative events compared to adults, regardless of the valence strength of the events. The current work aimed to confirm this age-related difference in response to emotional stimuli of diverse intensities by examining Electroencephalography (EEG) oscillatory power in time-frequency analysis.

METHODS

Time-frequency analyses were performed on the EEG data recorded for highly negative (HN), moderately negative (MN) and Neutral pictures in 20 adolescents and 20 adults during a covert emotional task. The results showed a significant age by emotion interaction effect in the theta and beta oscillatory power during the 500-600 ms post stimulus.

RESULTS

Adolescents showed significantly less pronounced theta synchronization (ERS, 5.5-7.5 Hz) for HN stimuli, and larger beta desynchronization (ERD; 18-20 Hz) for both HN and MN stimuli, in comparison with neutral stimuli. By contrast, adults exhibited no significant emotion effects in theta and beta frequency bands. In addition, the analysis of the alpha spectral power (10.5-12 Hz; 850-950 ms) showed a main effect of emotion, while the emotion by age interaction was not significant. Irrespective of adolescents or adults, HN and MN stimuli elicited enhanced alpha suppression compared to Neutral stimuli, while the alpha power was similar across HN and MN conditions.

CONCLUSIONS

These results confirmed prior findings that adolescents are more sensitive to emotionally negative stimuli compared to adults, regardless of emotion intensity, possibly due to the developing prefrontal control system during adolescence.

摘要

背景

我们最近的事件相关电位(ERP)研究表明,与成年人相比,青少年对负面事件在情感上更为敏感,无论这些事件的效价强度如何。当前的研究旨在通过检查时频分析中的脑电图(EEG)振荡功率,来证实这种与年龄相关的对不同强度情感刺激反应的差异。

方法

在一项隐蔽情感任务期间,对20名青少年和20名成年人观看高度负面(HN)、中度负面(MN)和中性图片时记录的EEG数据进行时频分析。结果显示,在刺激后500 - 600毫秒期间,θ波和β波振荡功率存在显著的年龄与情感交互作用效应。

结果

与中性刺激相比,青少年对HN刺激表现出明显较弱的θ波同步化(ERS,5.5 - 7.5赫兹),对HN和MN刺激均表现出较大的β波去同步化(ERD;18 - 20赫兹)。相比之下,成年人在θ波和β波频段未表现出显著的情感效应。此外,对α波频谱功率(10.5 - 12赫兹;850 - 950毫秒)的分析显示出情感的主效应,而情感与年龄的交互作用不显著。无论青少年还是成年人,与中性刺激相比,HN和MN刺激均引发增强的α波抑制,而HN和MN条件下的α波功率相似。

结论

这些结果证实了先前的发现,即与成年人相比,青少年对情感上的负面刺激更为敏感,无论情感强度如何,这可能是由于青少年时期前额叶控制系统的发育所致。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/376b/4870281/605ef5305953/fpsyg-07-00616-g001.jpg

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