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Altered alpha brain oscillations during multistable perception in schizophrenia.

Canan Basar-Eroglu1, Birgit Mathes1, Ksenia Khalaidovski1

  • 1University of Bremen, Institute of Psychology and Cognition Research, Grazer Str.4, D-28359 Bremen, Germany; Centre for Cognitive Science, Bremen, Germany.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|March 10, 2015
PubMed
Summary

Individuals with schizophrenia exhibit distinct alpha oscillation patterns during ambiguous perception tasks, suggesting altered sensory processing and challenges in maintaining coherent perception.

Keywords:
Bottom-upBrain oscillationsMultistable perceptionObject perceptionSpatio-temporal integrationTop-down

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Schizophrenia involves impaired sensory and cognitive integration, affecting coherent perception.
  • Multistable perception, where visual stimuli yield multiple perceptions, may exacerbate these deficits.
  • Understanding neural mechanisms during ambiguous perception is crucial for schizophrenia research.

Purpose of the Study:

  • To investigate event-related alpha oscillations in schizophrenia patients during multistable perception.
  • To differentiate neural activity during perceptual stability versus perceptual reversal phases.
  • To explore how ambiguous stimuli impact perception in schizophrenia.

Main Methods:

  • Continuous viewing of ambiguous and unambiguous visual stimuli.
  • Recording event-related alpha oscillations (brain activity).
  • Manual response to indicate perceptual reversals for phase differentiation.

Main Results:

  • Schizophrenia patients and controls had similar perceptual reversal rates for ambiguous stimuli.
  • Patients showed larger alpha amplitudes during perceptual stability (non-reversion).
  • A stronger decrease in alpha activity preceded reversals in patients, especially at lower frequencies.

Conclusions:

  • Ambiguous perception tasks highlight specific deficits in maintaining coherent perception in schizophrenia.
  • Patients may rely more on bottom-up sensory information due to reduced top-down influences.
  • Altered alpha oscillations reflect distinct perceptual processing in schizophrenia during ambiguous conditions.