One theory of auditory dysfunction in schizophrenia posits a decreased capacity to form distinct representations for different sounds, which is supported by numerous behavioral findings that show impaired ability to discriminate tones of different frequencies. The purpose of the proposed study is to identify the neural mechanisms of this auditory coding imprecision in schizophrenia by measuring event-related brain potentials (ERPs) related to auditory sensory processing in chronic schizophrenia patients compared with healthy matched controls. The ERP paradigm will assess the capacity of the auditory system to suppress activity of neurons adjacent to those previously stimulated, which results in sharper stimulus representations. In the same participants, we will also correlate frequency discrimination ability and gray matter volumes of brain regions containing primary and secondary auditory cortex with ERP measures of auditory processing. Finally, in patients we will correlate clinical measures with ERP measures of auditory processing. Associating deficient physiological mechanisms of sensory coding imprecision with brain substrates and clinical measures will potentially enable a better understanding of how to treat perceptual and cognitive problems in schizophrenia.

Public Health Relevance

This project seeks to identify mechanisms of auditory processing dysfunction and their substrates in auditory cortex in schizophrenia that contribute to difficulty in sound perception, from discriminating the frequencies of pairs of simple tones to identifying the vocal affect of speech. Identifying mechanisms and anatomical substrates of auditory perception difficulties may lead to more specific therapeutic targeting of perceptual and cognitive dysfunction in schizophrenia.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Exploratory/Developmental Grants (R21)
Project #
1R21MH079987-01A2
Application #
7588476
Study Section
Special Emphasis Panel (ZRG1-BDCN-N (02))
Program Officer
Meinecke, Douglas L
Project Start
2009-01-21
Project End
2010-11-30
Budget Start
2009-01-21
Budget End
2009-11-30
Support Year
1
Fiscal Year
2009
Total Cost
$204,796
Indirect Cost
Name
University of Nevada Las Vegas
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
098377336
City
Las Vegas
State
NV
Country
United States
Zip Code
89154
Ramage, Erin M; Klimas, Nedka; Vogel, Sally J et al. (2016) Concurrent sound segregation impairments in schizophrenia: The contribution of auditory-specific and general cognitive factors. Schizophr Res 170:95-101
Ramage, Erin M; Weintraub, David M; Vogel, Sally J et al. (2015) Preliminary evidence for reduced auditory lateral suppression in schizophrenia. Schizophr Res 162:269-75
Weintraub, David M; Ramage, Erin M; Sutton, Griffin et al. (2012) Auditory stream segregation impairments in schizophrenia. Psychophysiology 49:1372-83
Ramage, Erin M; Weintraub, David M; Allen, Daniel N et al. (2012) Evidence for stimulus-general impairments on auditory stream segregation tasks in schizophrenia. J Psychiatr Res 46:1540-5