Altered gamma and theta oscillations during multistable perception in schizophrenia.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
Linda RürupC Başar-Eroglu

Abstract

Coherent object perception in patients with schizophrenia is known to be impaired. Oscillatory brain dynamics constitute a fundamental mechanism for the coordinated communication of neural circuits. Such dynamics have been proposed to reflect impaired spatio-temporal integration of sensory and cognitive processes during object perception in schizophrenia. EEG recordings of patients with schizophrenia (n = 23) and control participants (n = 23) were examined. Presented were either an ambiguous (multistable) stimulus, endogenously inducing switching between two perceptual alternatives, or a slightly modified unambiguous control stimulus, during which perceptual reversals were triggered by a minor change in the stimulus configuration. Event-related amplitude modulation induced by perceptual reversals was analyzed for theta (3-8 Hz) and gamma band oscillations (28-48 Hz). Patients displayed increased reaction times and more errors when indicating unambiguous reversals. The patients´ amplitude enhancement of theta oscillations was diminished in both task conditions. During the control task were gamma amplitudes larger in patients than in healthy participants. The results indicate that impairments in generating coherent percepts are r...Continue Reading

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Citations

Dec 12, 2020·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Sirel KarakaşGiuseppe Augusto Chiarenza

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