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Perceptual visual dependence for spatial orientation in patients with schizophrenia

BACKGROUND: Patients with schizophrenia are reported to have vestibular dysfunction and to weigh vestibular input to a lesser extent compared to healthy controls. Such deficits may increase visual dependence (VD) for spatial orientation at a perceptual level in these patients. The aim of this study...

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Autores principales: Razzak, Rima Abdul, Jahrami, Haitham, Husni, Mariwan, Ali, Maryam Ebrahim, Bagust, Jeff
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9714874/
https://www.ncbi.nlm.nih.gov/pubmed/36455045
http://dx.doi.org/10.1371/journal.pone.0278718
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author Razzak, Rima Abdul
Jahrami, Haitham
Husni, Mariwan
Ali, Maryam Ebrahim
Bagust, Jeff
author_facet Razzak, Rima Abdul
Jahrami, Haitham
Husni, Mariwan
Ali, Maryam Ebrahim
Bagust, Jeff
author_sort Razzak, Rima Abdul
collection PubMed
description BACKGROUND: Patients with schizophrenia are reported to have vestibular dysfunction and to weigh vestibular input to a lesser extent compared to healthy controls. Such deficits may increase visual dependence (VD) for spatial orientation at a perceptual level in these patients. The aim of this study is to compare VD levels between healthy control and patients with schizophrenia and to explore associations between VD and clinical measures in these patients. Relation of VD to antipsychotic drug treatment is also discussed. METHOD: 18 patients with schizophrenia and 19 healthy controls participated in this study. The Rod and Disc Test (RDT) was used to create an optokinetic surround around a centrally located rod. Participants aligned the rod to their subjective visual vertical (SVV) in both static and dynamic disc conditions. VD was calculated as the difference in SVV between these two conditions. RESULTS: There was no group difference or gender difference in static or dynamic SVV as well as VD. There was no correlation between VD and any of the Positive and Negative Syndrome Scale (PANSS) scores, however VD was significantly correlated to illness duration in the patient group. CONCLUSIONS: Schizophrenia is not associated with greater VD levels at a perceptual level, compared to controls, indicating adequate visuo-vestibular integration for judging line verticality in these patients. Patients with greater chronicity of the disease are more visually dependent than those less chronically ill, consistent with previous reports of possible vestibular dysfunction in patients with schizophrenia. This may affect their daily functioning in dynamic visual environments.
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spelling pubmed-97148742022-12-02 Perceptual visual dependence for spatial orientation in patients with schizophrenia Razzak, Rima Abdul Jahrami, Haitham Husni, Mariwan Ali, Maryam Ebrahim Bagust, Jeff PLoS One Research Article BACKGROUND: Patients with schizophrenia are reported to have vestibular dysfunction and to weigh vestibular input to a lesser extent compared to healthy controls. Such deficits may increase visual dependence (VD) for spatial orientation at a perceptual level in these patients. The aim of this study is to compare VD levels between healthy control and patients with schizophrenia and to explore associations between VD and clinical measures in these patients. Relation of VD to antipsychotic drug treatment is also discussed. METHOD: 18 patients with schizophrenia and 19 healthy controls participated in this study. The Rod and Disc Test (RDT) was used to create an optokinetic surround around a centrally located rod. Participants aligned the rod to their subjective visual vertical (SVV) in both static and dynamic disc conditions. VD was calculated as the difference in SVV between these two conditions. RESULTS: There was no group difference or gender difference in static or dynamic SVV as well as VD. There was no correlation between VD and any of the Positive and Negative Syndrome Scale (PANSS) scores, however VD was significantly correlated to illness duration in the patient group. CONCLUSIONS: Schizophrenia is not associated with greater VD levels at a perceptual level, compared to controls, indicating adequate visuo-vestibular integration for judging line verticality in these patients. Patients with greater chronicity of the disease are more visually dependent than those less chronically ill, consistent with previous reports of possible vestibular dysfunction in patients with schizophrenia. This may affect their daily functioning in dynamic visual environments. Public Library of Science 2022-12-01 /pmc/articles/PMC9714874/ /pubmed/36455045 http://dx.doi.org/10.1371/journal.pone.0278718 Text en © 2022 Razzak et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Razzak, Rima Abdul
Jahrami, Haitham
Husni, Mariwan
Ali, Maryam Ebrahim
Bagust, Jeff
Perceptual visual dependence for spatial orientation in patients with schizophrenia
title Perceptual visual dependence for spatial orientation in patients with schizophrenia
title_full Perceptual visual dependence for spatial orientation in patients with schizophrenia
title_fullStr Perceptual visual dependence for spatial orientation in patients with schizophrenia
title_full_unstemmed Perceptual visual dependence for spatial orientation in patients with schizophrenia
title_short Perceptual visual dependence for spatial orientation in patients with schizophrenia
title_sort perceptual visual dependence for spatial orientation in patients with schizophrenia
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9714874/
https://www.ncbi.nlm.nih.gov/pubmed/36455045
http://dx.doi.org/10.1371/journal.pone.0278718
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