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Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia

Studies show that patients with schizophrenia exhibit impaired responses to sensory stimuli, especially at the early stages of neural processing. In particular, patients’ alpha-band (8–14 Hz) event-related desynchronization (ERD) and visual P1 event-related potential (ERP) component tend to be signi...

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Detalles Bibliográficos
Autores principales: Abeles, Ilana Y., Gomez-Ramirez, Manuel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3960158/
https://www.ncbi.nlm.nih.gov/pubmed/24646909
http://dx.doi.org/10.1371/journal.pone.0091720
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author Abeles, Ilana Y.
Gomez-Ramirez, Manuel
author_facet Abeles, Ilana Y.
Gomez-Ramirez, Manuel
author_sort Abeles, Ilana Y.
collection PubMed
description Studies show that patients with schizophrenia exhibit impaired responses to sensory stimuli, especially at the early stages of neural processing. In particular, patients’ alpha-band (8–14 Hz) event-related desynchronization (ERD) and visual P1 event-related potential (ERP) component tend to be significantly reduced, with P1 ERP deficits greater for visual stimuli biased towards the magnocellular system. In healthy controls, studies show that pre-stimulus alpha (background alpha) plays a pivotal role in sensory processing and behavior, largely by shaping the neural responses to incoming stimuli. Here, we address whether patients’ ERD and P1 deficits stem from impairments in pre-stimulus alpha mechanisms. To address this question we recorded electrophysiological activity in patients with schizophrenia and healthy controls while they engaged in a visual discrimination task with low, medium, and high contrast stimuli. The results revealed a significant decrease in patients’ ERDs, which was largely driven by reductions in pre-stimulus alpha. These reductions were most prominent in right-hemispheric areas. We also observed a systematic relationship between pre-stimulus alpha and the P1 component across different contrast levels. However, this relationship was only observed in healthy controls. Taken together, these findings highlight a substantial anomaly in patients’ amplitude-based alpha background activity over visual areas. The results provide further support that pre-stimulus alpha activity plays an active role in perception by modulating the neural responses to incoming sensory inputs, a mechanism that seems to be compromised in schizophrenia.
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spelling pubmed-39601582014-03-27 Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia Abeles, Ilana Y. Gomez-Ramirez, Manuel PLoS One Research Article Studies show that patients with schizophrenia exhibit impaired responses to sensory stimuli, especially at the early stages of neural processing. In particular, patients’ alpha-band (8–14 Hz) event-related desynchronization (ERD) and visual P1 event-related potential (ERP) component tend to be significantly reduced, with P1 ERP deficits greater for visual stimuli biased towards the magnocellular system. In healthy controls, studies show that pre-stimulus alpha (background alpha) plays a pivotal role in sensory processing and behavior, largely by shaping the neural responses to incoming stimuli. Here, we address whether patients’ ERD and P1 deficits stem from impairments in pre-stimulus alpha mechanisms. To address this question we recorded electrophysiological activity in patients with schizophrenia and healthy controls while they engaged in a visual discrimination task with low, medium, and high contrast stimuli. The results revealed a significant decrease in patients’ ERDs, which was largely driven by reductions in pre-stimulus alpha. These reductions were most prominent in right-hemispheric areas. We also observed a systematic relationship between pre-stimulus alpha and the P1 component across different contrast levels. However, this relationship was only observed in healthy controls. Taken together, these findings highlight a substantial anomaly in patients’ amplitude-based alpha background activity over visual areas. The results provide further support that pre-stimulus alpha activity plays an active role in perception by modulating the neural responses to incoming sensory inputs, a mechanism that seems to be compromised in schizophrenia. Public Library of Science 2014-03-19 /pmc/articles/PMC3960158/ /pubmed/24646909 http://dx.doi.org/10.1371/journal.pone.0091720 Text en © 2014 Abeles, Gomez-Ramirez http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Abeles, Ilana Y.
Gomez-Ramirez, Manuel
Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia
title Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia
title_full Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia
title_fullStr Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia
title_full_unstemmed Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia
title_short Impairments in Background and Event-Related Alpha-Band Oscillatory Activity in Patients with Schizophrenia
title_sort impairments in background and event-related alpha-band oscillatory activity in patients with schizophrenia
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3960158/
https://www.ncbi.nlm.nih.gov/pubmed/24646909
http://dx.doi.org/10.1371/journal.pone.0091720
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