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Low-frequency EEG oscillations associated with information processing in schizophrenia

Authors :
Peter F. Liddle
Kristin R. Laurens
Kent A. Kiehl
Alan T. Bates
Source :
Schizophrenia Research. 115:222-230
Publication Year :
2009
Publisher :
Elsevier BV, 2009.

Abstract

Numerous studies have described attenuated event-related potential (ERP) component amplitudes in schizophrenia (e.g., P300, Mismatch Negativity (MMN), Error Negativity/Error-Related Negativity (Ne/ERN)). Functional magnetic resonance imaging (fMRI) studies have typically shown decreased recruitment of diverse brain areas during performance of tasks that elicit the above ERP components. Recent research suggests that phase-resetting of slow-oscillations (e.g., in the delta and theta bands) underlies the potentials observed in ERP averages. Several studies have reported that slow-oscillations are increased in amplitude in people with schizophrenia at rest. Few studies have examined event-related low-frequency oscillations in schizophrenia. We examined event-related evoked and induced delta and theta activity in 17 people with schizophrenia and 17 healthy controls in two go/no-go task variants. We analyzed stimulus-related and response-related oscillations associated with correct-hits, correct-rejects and false-alarms. Our results reveal a pattern of reduced delta and theta activity for task-relevant events in schizophrenia. The findings indicate that while low-frequency oscillations are increased in amplitude at rest, they are not coordinated effectively in schizophrenia during various information processing tasks including target-detection, response-inhibition and error-detection. This slow-oscillation coordination abnormality may help explain the decreased recruitment of brain areas seen in fMRI studies.

Details

ISSN :
09209964
Volume :
115
Database :
OpenAIRE
Journal :
Schizophrenia Research
Accession number :
edsair.doi.dedup.....5b593a3bda7dd91f14eab7ba8e2c01ed
Full Text :
https://doi.org/10.1016/j.schres.2009.09.036