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      Changes in visual size perception in schizophrenia and depression Translated title: Alterações na percepção visual de tamanho na esquizofrenia e depressão Translated title: Cambios en la percepción del tamaño en la esquizofrenia y la depressión

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          Abstract

          The objective of this research was to measure possible changes in visual size perception of patients with depression and schizophrenia. Three groups were compared: Control Group (CG), Schizophrenia Group (SchG) and Depression Group (DepG). The diameter of the first figure seen by the participants in each painting was recorded in degrees of visual angle. The SchG perceived images 1.47 larger than CG and the DepG 1.28 larger than CG, whereas SchG selected images 1.15 larger than DepG, F (2, 57) = 17.677, p < .0001. These findings suggest there are changes in visual size perception related to depression and schizophrenia.

          Translated abstract

          O objetivo desta pesquisa foi medir possíveis alterações na percepção visual do tamanho de pacientes com depressão e esquizofrenia. Três grupos foram comparados: Grupo Controle (GC), Grupo Esquizofrenia (SchG) e Grupo Depressão (DepG). O diâmetro da primeira figura vista pelos participantes em cada pintura foi registrado em graus de ângulo visual. O SchG percebeu imagens 1.47 maiores que o GC e o DepG 1.28 maior que o GC, enquanto SchG selecionou imagens 1.15 maiores que DepG, F (2, 57) = 17.677, p < .0001. Esses achados sugerem que há alterações na percepção visual de tamanho relacionadas à depressão e esquizofrenia.

          Translated abstract

          El objetivo de esta investigación fue medir posibles cambios en la percepción del tamaño de pacientes con depresión y esquizofrenia. Se compararon tres grupos: Grupo de control (CG), Grupo de esquizofrenia (SchG) y Grupo de depresión (DepG). El diámetro de la primera figura vista por los participantes se registró en grados de ángulo visual. SchG percibió imágenes 1.47 más grandes que CG y DepG 1.28 más grandes que CG, mientras que SchG seleccionó imágenes 1.15 más grandes que DepG, F (2, 57) = 17.677, p < .0001. Hay cambios en la percepción del tamaño relacionados con depresión y esquizofrenia.

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          Perceptual organization impairment in schizophrenia and associated brain mechanisms: review of research from 2005 to 2010.

          Perceptual organization (PO) refers to the processes by which visual information is structured into coherent patterns such as groups, contours, perceptual wholes, and object representations. Impairments in PO have been demonstrated in schizophrenia since the 1960s and have been linked to several illness-related factors including poor premorbid functioning, poor prognosis, and disorganized symptoms. This literature was last reviewed in 2005. Since then, electrophysiological (electroencephalographic, event-related potential, and magnetoencephalographic) and fMRI studies in both patient and nonpatient samples have clarified brain mechanisms involved in the impairment, and additional behavioral studies in patients and nonpatients have clarified the computational mechanisms. In addition, data now exist on the functional consequences of PO impairments, in terms of secondary difficulties in face processing, selective attention, working memory, and social cognition. Preliminary data on drug effects on PO and on changes in response to treatment suggest that anomalies in PO may furnish a biomarker for the integrity of its associated biological mechanisms. All of this recent evidence allows for a clearer picture of the nature of the impairment and how it relates to broader aspects of brain and behavioral functioning in schizophrenia.
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            Abnormal visual motion processing in schizophrenia: a review of research progress.

            Ying Chen (2011)
            Motion processing represents a perceptual domain in which dynamic visual information is encoded to support the perception of movement. Research over the last decade has found a variety of abnormalities in the processing of motion information in schizophrenia. The abnormalities span from discrimination of basic motion features (such as speed) to integration of spatially distributed motion signals (such as coherent motion). Motion processing involves visual signals across space and time and thus presents a special opportunity to examine how spatial and temporal information is integrated in the visual system. This article surveys the behavioral and neuroimaging studies that probe into the spatial integration of motion information in schizophrenia. An emerging theme from these studies points to an imbalanced regulation of spatial interaction processes as a potential mechanism mediating different levels of abnormal motion processing in schizophrenia. The synthesis of these mechanism-driven studies suggests that further investigation of the neural basis and functional consequences of this abnormal motion processing are needed in order to render a basic biomarker for assessment and intervention of cognitive dysfunction in this mental disorder.
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              Increased Occipital Cortex GABA Concentrations in Depressed Patients After Therapy With Selective Serotonin Reuptake Inhibitors

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                Author and article information

                Journal
                psipesq
                Psicologia em Pesquisa
                Psicol. pesq.
                Programa de Pós-Graduação em Psicologia da UFJF (Juiz de Fora, MG, Brazil )
                1982-1247
                2020
                : 14
                : spe
                : 140-153
                Affiliations
                [03] orgnameFaculdade do Vale do Ipojuca
                [02] orgnameUniversidade Federal de Pernambuco maria.simas@ 123456ufpe.br
                [01] orgnameUniversidade Federal de Pernambuco
                Article
                S1982-12472020000400010 S1982-1247(20)01400000010
                10.34019/1982-1247.2020.v14.30411
                718aaf05-0a94-49b5-a86e-2dbaefa8a499

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 30 April 2020
                : 02 September 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 44, Pages: 14
                Product

                SciELO Periódicos Eletrônicos em Psicologia


                Size perception,Percepção de tamanho,Visual perception,Esquizofrenia,Depression,Schizophrenia,Percepção visual,Depressão,Percepción visual,Percepción del tamaño,Depresión

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