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On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception?

Schizophrenia is associated with a series of visual perception impairments, which might impact on the patients’ every day life and be related to clinical symptoms. However, the heterogeneity of the visual disorders make it a challenge to understand both the mechanisms and the consequences of these i...

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Autores principales: Giersch, Anne, Lalanne, Laurence, van Assche, Mitsouko, Elliott, Mark A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3664782/
https://www.ncbi.nlm.nih.gov/pubmed/23755027
http://dx.doi.org/10.3389/fpsyg.2013.00281
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author Giersch, Anne
Lalanne, Laurence
van Assche, Mitsouko
Elliott, Mark A.
author_facet Giersch, Anne
Lalanne, Laurence
van Assche, Mitsouko
Elliott, Mark A.
author_sort Giersch, Anne
collection PubMed
description Schizophrenia is associated with a series of visual perception impairments, which might impact on the patients’ every day life and be related to clinical symptoms. However, the heterogeneity of the visual disorders make it a challenge to understand both the mechanisms and the consequences of these impairments, i.e., the way patients experience the outer world. Based on earlier psychiatry literature, we argue that issues regarding time might shed a new light on the disorders observed in patients with schizophrenia. We will briefly review the mechanisms involved in the sense of time continuity and clinical evidence that they are impaired in patients with schizophrenia. We will then summarize a recent experimental approach regarding the coding of time-event structure in time, namely the ability to discriminate between simultaneous and asynchronous events. The use of an original method of analysis allowed us to distinguish between explicit and implicit judgments of synchrony. We showed that for SOAs below 20 ms neither patients nor controls fuse events in time. On the contrary subjects distinguish events at an implicit level even when judging them as synchronous. In addition, the implicit responses of patients and controls differ qualitatively. It is as if controls always put more weight on the last occurred event, whereas patients have a difficulty to follow events in time at an implicit level. In patients, there is a clear dissociation between results at short and large asynchronies, that suggest selective mechanisms for the implicit coding of time-event structure. These results might explain the disruption of the sense of time continuity in patients. We argue that this line of research might also help us to better understand the mechanisms of the visual impairments in patients and how they see their environment.
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spelling pubmed-36647822013-06-10 On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception? Giersch, Anne Lalanne, Laurence van Assche, Mitsouko Elliott, Mark A. Front Psychol Psychology Schizophrenia is associated with a series of visual perception impairments, which might impact on the patients’ every day life and be related to clinical symptoms. However, the heterogeneity of the visual disorders make it a challenge to understand both the mechanisms and the consequences of these impairments, i.e., the way patients experience the outer world. Based on earlier psychiatry literature, we argue that issues regarding time might shed a new light on the disorders observed in patients with schizophrenia. We will briefly review the mechanisms involved in the sense of time continuity and clinical evidence that they are impaired in patients with schizophrenia. We will then summarize a recent experimental approach regarding the coding of time-event structure in time, namely the ability to discriminate between simultaneous and asynchronous events. The use of an original method of analysis allowed us to distinguish between explicit and implicit judgments of synchrony. We showed that for SOAs below 20 ms neither patients nor controls fuse events in time. On the contrary subjects distinguish events at an implicit level even when judging them as synchronous. In addition, the implicit responses of patients and controls differ qualitatively. It is as if controls always put more weight on the last occurred event, whereas patients have a difficulty to follow events in time at an implicit level. In patients, there is a clear dissociation between results at short and large asynchronies, that suggest selective mechanisms for the implicit coding of time-event structure. These results might explain the disruption of the sense of time continuity in patients. We argue that this line of research might also help us to better understand the mechanisms of the visual impairments in patients and how they see their environment. Frontiers Media S.A. 2013-05-28 /pmc/articles/PMC3664782/ /pubmed/23755027 http://dx.doi.org/10.3389/fpsyg.2013.00281 Text en Copyright © 2013 Giersch, Lalanne, Assche and Elliott. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.
spellingShingle Psychology
Giersch, Anne
Lalanne, Laurence
van Assche, Mitsouko
Elliott, Mark A.
On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception?
title On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception?
title_full On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception?
title_fullStr On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception?
title_full_unstemmed On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception?
title_short On Disturbed Time Continuity in Schizophrenia: An Elementary Impairment in Visual Perception?
title_sort on disturbed time continuity in schizophrenia: an elementary impairment in visual perception?
topic Psychology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3664782/
https://www.ncbi.nlm.nih.gov/pubmed/23755027
http://dx.doi.org/10.3389/fpsyg.2013.00281
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