Early and late stages of neural speech processing in native-English and native-Polish listeners: A behavioral and ERP study
Item
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Title
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Early and late stages of neural speech processing in native-English and native-Polish listeners: A behavioral and ERP study
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Identifier
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d_2009_2013:3b7cc81fcd3a:10806
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identifier
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10957
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Creator
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Wagner, Monica,
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Contributor
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Valerie L. Shafer
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Date
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2011
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Language
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English
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Publisher
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City University of New York.
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Subject
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Neurosciences | Cognitive psychology | Linguistics | consonant clusters pt and st | event-related potentials | Late Positive Component | native-Language Speech Perception | contextual effects | P1N1P2 | T-Complex
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Abstract
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The effect of exposure to the contextual features of the consonant cluster /pt/ on speech perception was investigated in native-English and native-Polish listeners using behavioral and ERP methodology. English and Polish listeners experience the consonant cluster /pt/ in their languages, but only the Polish group experiences the cluster in the context examined in the current experiment (i.e., word onset). Acoustic features of phonemes change with context and, therefore, only the Polish listeners are exposed to the acoustic features of the word onset /pt/ cluster. The /st/ cluster occurs in both English and Polish in word onset and, therefore, the /st/ cluster was used as an experimental control. Also, because the /st/ and /pt/ clusters have different acoustic characteristics, the influence of these characteristics on speech perception, irrespective of native-language exposure was examined.;Two and three-syllable nonsense words beginning with /pt/, p[schwa]t/, /st/ and /s[schwa]t/ were presented within same and different word pairs. A syllable identification task performed in response to the second word in the pair revealed that Polish listeners were able to distinguish /pt/ and /p[schwa]t/ nonsense words but English listeners were not, suggesting that contextual features of phonemes are intrinsic to perceptual speech processing. ERP responses to the second word in the pair revealed native-language speech perception to be reflected late in latency within the LPC and P400. Sensory-obligatory responses from fronto-temporal sites (P1N1P2 complex) in response to the first word in the pairs revealed auditory signature waveforms for the 2 and 3-syllable pt word forms that were the highly similar for the English and Polish listeners. In contrast, English and Polish groups showed different sensory-obligatory responses from lateral-temporal sites (T-Complex) to the 2-syllable pt word forms reflecting native-language speech perception and these differences began early in cortical processing at 40 ms. Together, these findings suggest that both acoustic and linguistic distinctions are reflected at both early and late stages of cortical speech processing but from different brain sources. Also, neurophysiological differences in response to the acoustic characteristics of the /st/ and /pt/ stimuli, irrespective of native language, were evident.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Speech and Hearing Sciences
