The current study employed behavioral and electrophysiological measures to investigate the timing, localization, and neural oscillation characteristics of cortical activities associated with phonetic and emotional information processing of speech. The experimental design used a cross-modal priming paradigm in which the normal adult participants were presented a visual prime followed by an auditory target. Primes were facial expressions that systematically varied in emotional content (happy or angry) and mouth shape (corresponding to /a/ or /i/ vowels). Targets were spoken words that varied by emotional prosody (happy or angry) and vowel (/a/ or /i/). In both the phonetic and prosodic conditions, participants were asked to judge congruency status of the visual prime and the auditory target. Behavioral results showed a congruency effect for both percent correct and reaction time. Two ERP responses, the N400 and late positive response (LPR), were identified in both conditions. Source localization and inter-trial phase coherence of the N400 and LPR components further revealed different cortical contributions and neural oscillation patterns for selective processing of phonetic and emotional information in speech. The results provide corroborating evidence for the necessity of differentiating brain mechanisms underlying the representation and processing of co-existing linguistic and paralinguistic information in spoken language, which has important implications for theoretical models of speech recognition as well as clinical studies on the neural bases of language and social communication deficits.
|Original language||English (US)|
|Number of pages||13|
|State||Published - Feb 1 2016|
Bibliographical noteFunding Information:
This research project was supported in part by the University of Minnesota’s Undergraduate Research Opportunity Program (UROP), the Bryng Bryngelson Research Fund , and the Brain Imaging Research Project Award from the College of Liberal Arts. Portions of the work were written during the corresponding author’s visiting professorship at Shanghai Jiao Tong University. We would like to thank Drs. Sharon Miller, Tess Koerner, Aparna Rao, Benjamin Munson, and Edward Carney as well as two anonymous reviewers for their suggestions and help.
© 2016 Elsevier Ltd.
Copyright 2017 Elsevier B.V., All rights reserved.
- Cortical oscillation
- Emotional prosody
- Speech perception