期刊
SCHIZOPHRENIA RESEARCH
卷 150, 期 2-3, 页码 519-525出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.schres.2013.08.023
关键词
Schizophrenia; High-frequency oscillations; Perceptual organization; Neural synchrony; First-episode; MEG
类别
资金
- NARSAD
- Neuronale Koordination Forschungsschwerpunkt Frankfurt (NeFF)
- Max-Planck Society
Introduction: High-frequency oscillations are important for sensory processing and dysfunctions in the amplitude and synchrony of beta-and gamma-band oscillations have been demonstrated in schizophrenia (ScZ). However, the presence of aberrant high-frequency oscillations in first-episode (FE), medication-naive patients during sensory processing is unclear. Methods: Magnetoencephalographic (MEG) data were recorded from 15 never-medicated, FE-ScZ patients and 20 matched healthy controls during the perception of Mooney faces. MEG data were analysed for spectral power and single-sensor phase-locking in the beta (13-25 Hz) and gamma- (25-140 Hz) frequency range. Results: FE-ScZ patients were characterized by significantly impaired sensory processing as indicated by a reduced discrimination index (A'). Impaired behavioural performance in ScZ-patients was accompanied by decreased spectral power in the high- (60-120 Hz) gamma-band range. In contrast, oscillations in the lower (25-60 Hz) gamma-band were largely intact and beta-band oscillations were increased. Analysis of cross-frequency coupling showed a reduced correlation between 60 and 120 Hz amplitude values and beta-band power in FE-ScZ-patients relative to controls. Discussion: Our findings show that impaired sensory processing in medication-naive, FE-schizophrenia is related to a dysregulation of neural oscillations which involves both an impairment in the generation of high gamma-band activity as well as a failure to downregulate task-irrelevant beta-band activity. Because of the interrelationship of these dysfunctions and the role of inhibitory networks in the shaping of high-frequency activity, aberrant neural oscillations in FE-schizophrenia may be linked to dysfunctions in the excitation-inhibition (E/I)-balance. (C) 2013 Elsevier B. V. All rights reserved.
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