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A neural electrophysiological study of lexical stress parsing

Yang , Ying (2013) A neural electrophysiological study of lexical stress parsing. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Based on past theory and empirical results on the processing of lexical-level suprasegmental information, a Cascading Inhibition model for lexical stress parsing was proposed, in which lexical stress is situated at a different level from segmental information in a hierarchical structure and influences lexical identification via two mediating levels. These levels were proposed to direct lexical identification in a parallel and statistical manner.

Because under this model, phonetic and lexical processing are both under the influence of lexical stress parsing, and because pre-attentive phonetic and lexical processing are both lateralized to the left hemisphere, two hypotheses were proposed: Hypothesis A: Lexical stress parsing can modulate lexical selection without the presence of segmental information; Hypothesis B: Lexical stress parsing is lateralized to the left hemisphere.

To test these hypotheses, Noun-Verb homonym pairs (e.g. INsult vs inSULT) were used as targets in experimental listening conditions. Sentences that strongly predicted the Noun member (e.g. INsult) of the pair were spliced to end with the Verb member (e.g. inSULT) to create lexical stress anomalies. In the critical conditions, when targets were low-pass filtered to remove segmental information, listeners had to rely on the Lexical Stress Pattern for lexical identification of the target. For control conditions, the prosody changes associated with a shift in sex of the speaker (Gender Shift) were investigated in an auditory oddball paradigm. It was predicted that processing nonlinguistic prosody such as Gender Shift, in contrast to lexical stress, would be lateralized to the right hemisphere.

Online EEG was recorded from right-handed young normal monolingual English speakers. For experimental conditions, the filtered Verb Lexical Stress Pattern induced larger N400 than filtered Noun Lexical Stress Pattern, and this component was left-lateralized, supporting both hypotheses. Global Field Power and source estimation demonstrated that the neural networks for parsing Lexical Stress Pattern were similar to those for processing segmental information. In control conditions, the P300 induced by Gender Shift was right lateralized. Overall, many features of the CI model were supported, but a direct influence from the prosody level to the lexical identification level is proposed to incorporate results from the current study.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Yang , Ying yiy17@pitt.eduYIY17
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairTompkins , Connie tompkins@pitt.eduTOMPKINS
Committee MemberMoncrieff , Deborah dmoncrie@pitt.eduDMONCRIE
Committee MemberPratt , Sheila spratt@pitt.eduSPRATT
Committee MemberBaum , Shari
Date: 22 January 2013
Date Type: Publication
Defense Date: 21 September 2012
Approval Date: 22 January 2013
Submission Date: 22 October 2012
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 199
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Communication Science and Disorders
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Lexical Stress, ERP, N400, Cascading Inhibition model
Date Deposited: 22 Jan 2013 15:01
Last Modified: 15 Nov 2016 14:05


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