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  An entrained rhythm’s frequency, not phase, influences temporal sampling of speech

Bosker, H. R., & Kösem, A. (2017). An entrained rhythm’s frequency, not phase, influences temporal sampling of speech. Talk presented at Interspeech 2017. Stockholm, Sweden. 2017-08-20 - 2017-08-24.

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 Creators:
Bosker, Hans R.1, Author              
Kösem, Anne2, Author              
Affiliations:
1Psychology of Language Department, MPI for Psycholinguistics, Max Planck Society, ou_792545              
2Neurobiology of Language Department, MPI for Psycholinguistics, Max Planck Society, ou_792551              

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Free keywords: neural entrainment, phase-locking, temporal sampling, speech parsing, rate normalization, speech rate
 Abstract: Brain oscillations have been shown to track the slow amplitude fluctuations in speech during comprehension. Moreover, there is evidence that these stimulus-induced cortical rhythms may persist even after the driving stimulus has ceased. However, how exactly this neural entrainment shapes speech perception remains debated. This behavioral study investigated whether and how the frequency and phase of an entrained rhythm would influence the temporal sampling of subsequent speech. In two behavioral experiments, participants were presented with slow and fast isochronous tone sequences, followed by Dutch target words ambiguous between as /ɑs/ “ash” (with a short vowel) and aas /a:s/ “bait” (with a long vowel). Target words were presented at various phases of the entrained rhythm. Both experiments revealed effects of the frequency of the tone sequence on target word perception: fast sequences biased listeners to more long /a:s/ responses. However, no evidence for phase effects could be discerned. These findings show that an entrained rhythm’s frequency, but not phase, influences the temporal sampling of subsequent speech. These outcomes are compatible with theories suggesting that sensory timing is evaluated relative to entrained frequency. Furthermore, they suggest that phase tracking of (syllabic) rhythms by theta oscillations plays a limited role in speech parsing.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Not specified
 Pages: -
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 Rev. Type: -
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Title: Interspeech 2017
Place of Event: Stockholm, Sweden
Start-/End Date: 2017-08-20 - 2017-08-24

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