Abstract
Four monkeys and 6 humans representing five different native languages were compared in the ability to categorize natural CV tokens of /b/ versus /d/ produced by 4 talkers of American English (2 male, 2 female) in four vowel contexts (/i, e, a, u/). A two-choice “left/right” procedure was used in which both percentage correct and response time data were compared between species. Both measures indicated striking context effects for monkeys, in that they performed better for the back vowels /a/ and /u/ than for the front vowels /i/ and /e/. Humans showed no context effects for the percentage correct measure, but their response times showed an enhancement for the /i/ vowel, in contrast with monkeys. Results suggest that monkey perception of place of articulation is more dependent than human perception on the direction of the F2 onset transitions of syllables, since back-vowel F2s differentiate /b/ and /d/ more distinctively. Although monkeys do not provide an accurate model of the adult human in place perception, they may be able to model the preverbal human infant before it learns a more speech-specific strategy of place information extraction.
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This research was supported by NIH Grant PHS R01 DC 00541-12 to J.M.S. C.S.G. was the recipient of a Carol P. Sinnott Graduate Student Research Award, and these data are based on his master’s thesis.
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Sinnott, J.M., Gilmore, C.S. Perception of place-of-articulation information in natural speech by monkeys versus humans. Perception & Psychophysics 66, 1341–1350 (2004). https://doi.org/10.3758/BF03195002
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DOI: https://doi.org/10.3758/BF03195002