Abstract
It is now possible to study how acoustic characteristics important for speech discrimination are represented in the discharge patterns of single auditory-nerve fibers. Responses to simple tonal stimuli and speechlike sounds (such as one or two formant synthetic stimuli) have been studied in order to elucidate the coding of certain vowel characteristics. At stimulus levels typical of speech, information about formant frequency is carried predominantly by fibers with characteristic frequencies close to the formant frequency, whereas information about fundamental frequency is present in fibers over a wide range of characteristic frequencies. Specific examples will be given for the representation of detailed spectral patterns for vowels and fricative consonants, of rapid changes in intensity and spectrum for stop and nasal consonants, and of speech signals in the presence of background noise. [Supported in part by NIH grants.]
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