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Brain substrates underlying auditory speech priming in healthy listeners and listeners with schizophrenia

Published online by Cambridge University Press:  29 November 2016

C. Wu ,
Y. Zheng ,
J. Li ,
H. Wu ,
S. She ,
S. Liu ,
Y. Ning  and
L. Li
C. Wu
Affiliation:
School of Psychological and Cognitive Sciences, and Beijing Key Laboratory of Behavior and Mental Health, Key Laboratory on Machine Perception (Ministry of Education), Peking University, Beijing, People's Republic of China School of Life Sciences, Peking University, Beijing, People's Republic of China School of Psychology, Beijing Normal University, Beijing, People's Republic of China
Y. Zheng
Affiliation:
The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, People's Republic of China
J. Li
Affiliation:
The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, People's Republic of China
H. Wu
Affiliation:
The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, People's Republic of China
S. She
Affiliation:
The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, People's Republic of China
S. Liu
Affiliation:
The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, People's Republic of China
Y. Ning
Affiliation:
The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, People's Republic of China
L. Li*
Affiliation:
School of Psychological and Cognitive Sciences, and Beijing Key Laboratory of Behavior and Mental Health, Key Laboratory on Machine Perception (Ministry of Education), Peking University, Beijing, People's Republic of China The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, People's Republic of China Beijing Institute for Brain Disorders, Capital Medical University, Beijing, People's Republic of China
*
*Address for correspondence: L. Li, School of Psychological and Cognitive Sciences, Peking University, Beijing 100080, People's Republic of China. (Email: liangli@pku.edu.cn)
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Abstract

Background

Under ‘cocktail party’ listening conditions, healthy listeners and listeners with schizophrenia can use temporally pre-presented auditory speech-priming (ASP) stimuli to improve target-speech recognition, even though listeners with schizophrenia are more vulnerable to informational speech masking.

Method

Using functional magnetic resonance imaging, this study searched for both brain substrates underlying the unmasking effect of ASP in 16 healthy controls and 22 patients with schizophrenia, and brain substrates underlying schizophrenia-related speech-recognition deficits under speech-masking conditions.

Results

In both controls and patients, introducing the ASP condition (against the auditory non-speech-priming condition) not only activated the left superior temporal gyrus (STG) and left posterior middle temporal gyrus (pMTG), but also enhanced functional connectivity of the left STG/pMTG with the left caudate. It also enhanced functional connectivity of the left STG/pMTG with the left pars triangularis of the inferior frontal gyrus (TriIFG) in controls and that with the left Rolandic operculum in patients. The strength of functional connectivity between the left STG and left TriIFG was correlated with target-speech recognition under the speech-masking condition in both controls and patients, but reduced in patients.

Conclusions

The left STG/pMTG and their ASP-related functional connectivity with both the left caudate and some frontal regions (the left TriIFG in healthy listeners and the left Rolandic operculum in listeners with schizophrenia) are involved in the unmasking effect of ASP, possibly through facilitating the following processes: masker-signal inhibition, target-speech encoding, and speech production. The schizophrenia-related reduction of functional connectivity between the left STG and left TriIFG augments the vulnerability of speech recognition to speech masking.

Keywords

Auditory speech priminginformational maskingpars triangularis of the inferior frontal gyrusschizophreniaspeech recognition
Type
Original Articles
Information
Psychological Medicine , Volume 47 , Issue 5 , April 2017 , pp. 837 - 852
Copyright
Copyright © Cambridge University Press 2016 

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Footnotes

† These authors contributed equally to this work and should be co-first authors.

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