Altered alpha brain oscillations during multistable perception in schizophrenia
| Autor: | Christina Schmiedt-Fehr, Andreas Brand, Canan Basar-Eroglu, Ksenia Khalaidovski, Birgit Mathes |
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| Rok vydání: | 2016 |
| Předmět: |
Adult
Male Time Factors genetic structures media_common.quotation_subject Sensory system Stimulus (physiology) Multistable perception behavioral disciplines and activities 050105 experimental psychology Perceptual Disorders Young Adult 03 medical and health sciences 0302 clinical medicine Physiology (medical) Perception Reaction Time Humans 0501 psychology and cognitive sciences In patient media_common Analysis of Variance Spectrum Analysis General Neuroscience 05 social sciences Brain Electroencephalography Cognition Alpha Rhythm Neuropsychology and Physiological Psychology Schizophrenia Visual Perception Alpha BRAIN Female Percept Psychology Photic Stimulation Psychomotor Performance psychological phenomena and processes 030217 neurology & neurosurgery Cognitive psychology |
| Zdroj: | International Journal of Psychophysiology. 103:118-128 |
| ISSN: | 0167-8760 |
| DOI: | 10.1016/j.ijpsycho.2015.02.002 |
| Popis: | Schizophrenia is a complex mental disorder with impairments in integrating sensory and cognitive functions, leading to severe problems in coherent perception. This impairment might be accelerated during multistable perception. Multistable perception is a phenomenon, where a visual pattern gives rise to at least two different perceptual representations. We addressed this issue by assessing event-related alpha oscillations during continuous viewing of an ambiguous and unambiguous control stimulus. Perceptual reversals were indicated by a manual response, allowing differentiation between phases of reversion and non-reversion (that is perceptual stability) in both tasks. During the ambiguous task, patients and controls showed a comparable number of perceptual reversals. Alpha amplitudes in patients were larger in non-reversion phases, accompanied by a stronger decrease of alpha activity preceding the perceptual reversal. This group difference was pronounced for lower alpha activity and not apparent during the unambiguous task. This indicates that ambiguous perception taps into the specific deficits that patients experience in maintaining coherent perception. Given that top-down influences in generating a meaningful percept seems to be low in patients, they appear more dependent on sensory information. Similar, bottom-up mechanisms might be more important in triggering perceptual reversals in patients than in controls. |
| Databáze: | OpenAIRE |
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