Epstein L H
Western Psychiatric Institute and Clinic, University of Pittsburgh School of Medicine, PA 15213.
Psychophysiology. 1990 Jan;27(1):68-72. doi: 10.1111/j.1469-8986.1990.tb02181.x.
This study was designed to assess differences in perception of activity in the zygomaticus major (predominant during smiling) and corrugator supercilii facial muscles (predominant during frowning). Magnitude production psychophysical methods were used to relate subjective intensity to objective electromyographic activity using a psychophysical power function under four conditions: smiling, frowning, smiling concurrent with maintenance of a frown, and frowning concurrent with maintenance of a smile. High correlation coefficients for each power function for both zygomatic and corrugator activity were obtained. Differences in sensitivity evaluated by comparing the exponent for slope of the power functions showed differences across the muscles and as a function of the conditions. The exponent for frowning was greater than for smiling. Although the exponent for zygomatic activity was similar with and without frowning, significantly greater exponents were shown for corrugator activity when concurrently frowning and smiling than when only frowning. Maximal electromyographic activity was greater in the zygomaticus major muscle during smiling than in the corrugator supercilii muscle during frowning. These results provide a methodology for perception of electromyographic activity which could be a useful basis for analysis of the role of perception in regulating affect.
本研究旨在评估在主要参与微笑的颧大肌和主要参与皱眉的皱眉肌中活动感知的差异。采用量级产生心理物理学方法，在四种条件下使用心理物理学幂函数将主观强度与客观肌电活动相关联：微笑、皱眉、微笑同时保持皱眉以及皱眉同时保持微笑。颧肌和皱眉肌活动的每个幂函数均获得了高相关系数。通过比较幂函数斜率的指数来评估的敏感性差异显示，不同肌肉之间以及作为条件的函数存在差异。皱眉的指数大于微笑的指数。尽管无论有无皱眉，颧肌活动的指数相似，但皱眉同时微笑时皱眉肌活动的指数显著大于仅皱眉时。微笑时颧大肌的最大肌电活动大于皱眉时皱眉肌的最大肌电活动。这些结果提供了一种肌电活动感知的方法，这可能是分析感知在调节情感中作用的有用基础。
