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To better understand the effects of listening environment on efficiency of phonetic processing, the present study examined the effects of signal degradation on phonetic processing of two-syllable sequences by normal-hearing listeners. Auditory temporal-order processing of American-English vowel sequences was compared across two listening conditions, each presented to a separate group of young, normal-hearing listeners: 1) unprocessed resynthesized stimuli and 2) stimuli that had been processed to simulate the signal produced by a 16-channel cochlear implant (CI). Using the methods of Fogerty, Humes and Kewley-Port [2010, J. Acoust. Soc. Am., 127, 2509-2520], 70-ms resynthesized versions of the syllables “pit, pet, put,” and “pot” were presented in a two-syllable temporal-order processing task. Task difficulty was increased by decreasing syllable-onset asynchrony (SOA), i.e., the duration between syllable onsets. SOA thresholds for accuracy of syllable-sequence identification were estimated using the method of constant stimuli on each of four 72-trial blocks. Data analyzed to date show a threshold difference of approximately 20 ms between the unprocessed and CI-processed listener groups, or a difference in threshold of a factor of two or greater. Results will be discussed with regard to implications for phonetic processing of speech in challenging listening environments and practical implications for CI users. To better understand the effects of listening environment on efficiency of phonetic processing, the present study examined the effects of signal degradation on phonetic processing of two-syllable sequences by normal-hearing listeners. Auditory temporal-order processing of American-English vowel sequences was compared across two listening conditions, each presented to a separate group of young, normal-hearing listeners: 1) unprocessed resynthesized stimuli and 2) stimuli that had been processed to simulate the signal produced by a 16-channel cochlear implant (CI). Using the methods of Fogerty, Humes and Kewley-Port [2010, J. Acoust. Soc. Am., 127, 2509-2520], 70-ms resynthesized versions of the syllables “pit, pet, put,” and “pot” were presented in a two-syllable temporal-order processing task. Task difficulty was increased by decreasing syllable-onset asynchrony (SOA), i.e., the duration between syllable onsets. SOA thresholds for accuracy of syllable-sequence identification were estimated using the metho... |
