Sugimoto Sayaka, Nittono Hiroshi, Hori Tadao
Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima 739-8521, Japan.
Int J Psychophysiol. 2007 Oct;66(1):1-9. doi: 10.1016/j.ijpsycho.2007.05.007. Epub 2007 May 23.
To examine whether brain electrical responses to environmental stimuli were influenced by emotional contexts, event-related potentials (ERPs) elicited by nonstartle probe tones were recorded from 13 student volunteers while they were viewing emotionally positive, neutral, and negative slides of the International Affective Picture System. The auditory stimuli consisted of high-deviant (2000 Hz, p=.08), low-deviant (1050 Hz, p=.08), and standard (1000 Hz, p=.84) tones with a mean onset-to-onset interval of 600 ms. Participants were told to ignore the tones. High-deviant tones elicited a larger N1 (peaking around 100 ms) when participants were viewing negative slides than when viewing positive slides. The amplitude of the P2 elicited by standard tones (peaking around 170 ms) was smaller when participants were viewing positive slides than when viewing negative and neutral slides. The amplitude of the mismatch negativity (150-200 ms) tended to reduce during positive slide presentation, but this difference appeared to be due to reduction of the P2 elicited by standard tones. These findings suggest that visually induced emotional states have a sequential effect on auditory information processing, in that the influence of negative emotion appears at an earlier stage than that of positive emotion.
为了研究大脑对环境刺激的电反应是否受情绪背景的影响，我们记录了13名学生志愿者在观看国际情感图片系统中情绪积极、中性和消极幻灯片时，由非惊吓探测音诱发的事件相关电位（ERP）。听觉刺激包括高偏差音（2000赫兹，p = 0.08）、低偏差音（1050赫兹，p = 0.08）和标准音（1000赫兹，p = 0.84），平均起始间隔为600毫秒。参与者被告知忽略这些音调。当参与者观看消极幻灯片时，高偏差音诱发的N1波（在100毫秒左右达到峰值）比观看积极幻灯片时更大。当参与者观看积极幻灯片时，标准音诱发的P2波（在170毫秒左右达到峰值）的幅度比观看消极和中性幻灯片时更小。在呈现积极幻灯片时，失配负波（150 - 200毫秒）的幅度趋于降低，但这种差异似乎是由于标准音诱发的P2波减小所致。这些发现表明，视觉诱发的情绪状态对听觉信息处理具有顺序效应，即消极情绪的影响比积极情绪出现在更早的阶段。
