Categorical Perception of Face Actions: Their Role in Sign Language and in Communicative Facial Displays: Ruth Campbell, Department of Human Communication Science, University College London; Bencie Woll, Department of Clinical Communication Sciences, City University, London; Philip J. Benson, University Laboratory of Physiology, Oxford; Simon B. Wallace, MRC Child Psychiatry Unit, Institute of Psychiatry, London (THE QUARTERLY JOURNAL OF EXPERIMENTAL PSYCHOLOGY, 1999, 52A (1), 67-95)
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