Best C T, Womer J S, Queen H F
Department of Psychology, Wesleyan University, Middletown, Connecticut 06459.
J Exp Psychol Hum Percept Perform. 1994 Aug;20(4):751-65. doi: 10.1037//0096-1523.20.4.751.
Accounts of emotion lateralization propose either overall right hemisphere (RH) advantage or differential RH versus left hemisphere (LH) involvement depending on the negative-positive valence of emotions. Perceptual studies generally show RH specialization. Yet viewer emotional responses may enhance valence effects. Because infant faces elicit heightened emotion in viewers, perceptual asymmetries with chimeric infant faces were assessed. First, it was determined that chimeras must be paired with their counterparts, not their mirror images, to tap viewers' sensitivity to adult facial asymmetries. Results showed an RH perceptual bias for infant cries but bihemispheric sensitivity to asymmetries in infant smiles. This effect was not due to LH featural versus RH holistic processing and held for additional, intensity-matched, spontaneous expressions. Specialized RH sensitivity to infant cries may reflect an evolutionary advantage for rapid response to infant distress.
关于情绪侧化的描述提出，要么整体右半球（RH）占优势，要么根据情绪的负正效价，右半球与左半球（LH）参与情况有所不同。知觉研究通常显示右半球具有特异性。然而，观察者的情绪反应可能会增强效价效应。由于婴儿面孔会引发观察者更强烈的情绪，因此对嵌合婴儿面孔的知觉不对称性进行了评估。首先，确定嵌合体必须与其对应物配对，而不是与它们的镜像配对，以挖掘观察者对成人面部不对称性的敏感性。结果显示，对于婴儿哭声存在右半球知觉偏差，但对婴儿微笑中的不对称性则是双侧半球敏感。这种效应并非由于左半球的特征性处理与右半球的整体性处理，并且在额外的、强度匹配的自发表情中也成立。右半球对婴儿哭声的特异性敏感性可能反映了对婴儿痛苦快速反应的进化优势。
