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Ten left hemisphere and 10 right hemisphere CVA patients were required to monitor for the target phoneme /b/ in a series of monosyllabic words, and a target timbre in a series of eight different timbres. Left hemisphere damaged aphasic patients were more accurate for target timbres over phonemes; the reverse pattern was found in the nonaphasic right hemisphere patients.
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Chobor et al. (1987) studied this question.
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