Abstract
Despite the constantly varying stream of sensory information that surrounds us, we humans can discern the small building blocks of words that constitute language (phonetic forms) and perceive them categorically (categorical perception, CP). Decades of controversy have prevailed regarding what is at the heart of CP, with many arguing that it is due to domain-general perceptual processing and others that it is determined by the existence of domain-specific linguistic processing. What is most key: perceptual or linguistic patterns? Here, we study whether CP occurs withsoundless handshapes that are nonethelessphonetic in American Sign Language (ASL), in signers and nonsigners. Using innovative methods and analyses of identification and, crucially, discrimination tasks, we found that both groups separated the soundless handshapes into two classes perceptually but that only the ASL signers exhibited linguistic CP. These findings suggest that CP of linguistic stimuli is based on linguistic categorization, rather than on purely perceptual categorization.
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Baker, S.A., Idsardi, W.J., Golinkoff, R.M. et al. The perception of handshapes in American Sign Language. Memory & Cognition 33, 887–904 (2005). https://doi.org/10.3758/BF03193083
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DOI: https://doi.org/10.3758/BF03193083