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情感图片加工:晚期正电位受动机相关性调节。

Affective picture processing: the late positive potential is modulated by motivational relevance.

作者信息

Schupp H T, Cuthbert B N, Bradley M M, Cacioppo J T, Ito T, Lang P J

机构信息

NIMH, University of Florida, Gainesville, USA.

出版信息

Psychophysiology. 2000 Mar;37(2):257-61.

Abstract

Recent studies have shown that the late positive component of the event-related-potential (ERP) is enhanced for emotional pictures, presented in an oddball paradigm, evaluated as distant from an established affective context. In other research, with context-free, random presentation, affectively intense pictures (pleasant and unpleasant) prompted similar enhanced ERP late positivity (compared with the neutral picture response). In an effort to reconcile interpretations of the late positive potential (LPP), ERPs to randomly ordered pictures were assessed, but using the faster presentation rate, brief exposure (1.5 s), and distinct sequences of six pictures, as in studies using an oddball based on evaluative distance. Again, results showed larger LPPs to pleasant and unpleasant pictures, compared with neutral pictures. Furthermore, affective pictures of high arousal elicited larger LPPs than less affectively intense pictures. The data support the view that late positivity to affective pictures is modulated both by their intrinsic motivational significance and the evaluative context of picture presentation.

摘要

最近的研究表明,在一种异常刺激范式中呈现的、被评估为与既定情感背景距离较远的情感图片,其事件相关电位(ERP)的晚期正成分会增强。在其他研究中,在无背景、随机呈现的情况下,情感强烈的图片(愉悦和不愉快的)会引发类似增强的ERP晚期正电位(与中性图片反应相比)。为了调和对晚期正电位(LPP)的解释,对随机排列图片的ERP进行了评估,但使用了更快的呈现速率、短暂曝光(1.5秒)以及六张图片的不同序列,就像基于评价距离的异常刺激研究那样。结果再次表明,与中性图片相比,愉悦和不愉快图片的LPP更大。此外,高唤醒的情感图片比情感强度较低的图片引发更大的LPP。这些数据支持这样一种观点,即对情感图片的晚期正电位既受到其内在动机意义的调节,也受到图片呈现的评价背景的调节。

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