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Workshop on the Auditory Basis of Speech PerceptionKeele University, UK |
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Workshop on the Auditory Basis of Speech PerceptionKeele University, UK |
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The poor frequency discrimination but superb temporal acuity of onset cells in the cochlear nucleus has led several authors to suggest that these cells might have a role somewhat akin to that of a "sampling gate", but specification of relevant neurally-represented "sampled signals" has been lacking.
In this paper, it is proposed that initial tone-burst-like segments of F2 aspiration may generate a contribution to dental perception in stop consonants, one which could be represented by cochlear nucleus cells possessing CF-exeitation, strong lower-frequency inhibition and some higher-frequency inhibition, and a graded decay of response, Psychophysical experiments with partially edited natural sounds show that the contribution of these segments to dental perception is enhanced by temporal coincidence with wideband clicks that are known to cause firing of onset cells; on the other hand, if the short tone burst occurs 4 ms or more after the click, perception migrates away from dental.
Bibliographic reference. Sá Marta, Eduardo / Perdigao, Fernando / Vieira de Sá, Luis (1996): "Psychophysical evidence for a sampling process, related to properties of onset cells, in stop consonant perception", In ABSP-1996, 106-109.