IMPROVED CATEGORIZATION OF SUBTLE FACIAL EXPRESSIONS MODULATES LATE POSITIVE POTENTIAL

被引:9
|
作者
Pollux, P. M. J. [1 ]
机构
[1] Lincoln Univ, Sch Psychol, Lincoln LN6 7TS, England
关键词
facial expression categorization; training; ERP; EVENT-RELATED POTENTIALS; RECOGNITION; EMOTION; ERP; PERCEPTION; HAPPINESS; FACE; IDENTIFICATION; SCHIZOPHRENIA; N170;
D O I
10.1016/j.neuroscience.2016.02.027
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Biases in facial expression recognition can be reduced successfully using feedback-based training tasks. Here we investigate with event-related potentials (ERPs) at which stages of stimulus processing emotion-related modulations are influenced by training. Categorization of subtle facial expressions (morphed from neutral to happy, sad or surprise) was trained with correct-response feedback on each trial. ERPs were recorded before and after training while participants categorized facial expressions without response feedback. Behavioral data demonstrated large improvements in categorization of subtle facial expression which transferred to new face models not used during training. ERPs were modulated by training from 450 ms post-stimulus onward, characterized by a more gradual increase in P3b/Late Positive Potential (LPP) amplitude as expression intensity increased. This effect was indistinguishable for faces used for training and for new faces. It was proposed that training elicited a more fine-grained analysis of facial information for all subtle expressions, resulting in improved recognition and enhanced emotional motivational salience (reflected in P3b/LPP amplitude) of faces previously categorized as expressing no emotion. (C) 2016 Published by Elsevier Ltd. on behalf of IBRO.
引用
收藏
页码:152 / 163
页数:12
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