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- W2079305983 abstract "A long-standing debate concerns whether humans are specialized for speech perception [1, 2, 3, 4, 5, 6, 7], which some researchers argue is demonstrated by the ability to understand synthetic speech with significantly reduced acoustic cues to phonetic content [2, 3, 4, 7]. We tested a chimpanzee (Pan troglodytes) that recognizes 128 spoken words [8, 9], asking whether she could understand such speech. Three experiments presented 48 individual words, with the animal selecting a corresponding visuographic symbol from among four alternatives. Experiment 1 tested spectrally reduced, noise-vocoded (NV) synthesis, originally developed to simulate input received by human cochlear-implant users [10]. Experiment 2 tested “impossibly unspeechlike” [3] sine-wave (SW) synthesis, which reduces speech to just three moving tones [11]. Although receiving only intermittent and noncontingent reward, the chimpanzee performed well above chance level, including when hearing synthetic versions for the first time. Recognition of SW words was least accurate but improved in experiment 3 when natural words in the same session were rewarded. The chimpanzee was more accurate with NV than SW versions, as were 32 human participants hearing these items. The chimpanzee's ability to spontaneously recognize acoustically reduced synthetic words suggests that experience rather than specialization is critical for speech-perception capabilities that some have suggested are uniquely human [12, 13, 14]." @default.
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- W2079305983 modified "2023-10-17" @default.
- W2079305983 title "Comments on project nim" @default.
- W2079305983 doi "https://doi.org/10.1016/s0047-2484(83)80153-5" @default.
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