Spatiotemporal visual processing in schizophrenia
Abstract
Studies examining visual processing in schizophrenia have provided inconsistent results. In this study, the authors measured static and dynamic visual contrast sensitivity (CS) in patients with schizophrenia (n=20) and control subjects (n=15). Extrapyramidal symptoms were evaluated with the Simpson-Angus scale. In the static condition, the patients with schizophrenia showed reduced CS in the spatial frequency range of 2.9-14.4 cycles per degree of visual angle (c/d). In the dynamic condition, CS loss was present over the whole range tested (0.5-14.4 c/d). Higher Simpson-Angus scores and higher doses of antipsychotic medication were associated with more severe CS deficits. These results suggest that the hypodopaminergic state induced by antipsychotic medication may produce parkinsonian visual impairments in schizophrenia patients.
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Patients with schizophrenia show preferential M-pathway dysfunction, although deficits have also been observed in parvocellular processing.
“Patients with schizophrenia show preferential M-pathway dysfunction (21,22,28,35–38), although deficits have also been observed in parvocellular processing (19,20).”
From Visual perception and its impairment in schizophrenia (2008) · cites this paper as [19]
Larger contrast sensitivity deficits were found when stimuli were presented dynamically rather than statically, suggesting greater M-pathway than P-pathway impairment.
“Similarly, larger contrast sensitivity deficits were found when stimuli were presented dynamically rather than statically, also suggesting greater M-pathway, than P-pathway, impairment (19).”
From Visual perception and its impairment in schizophrenia (2008) · cites this paper as [19]
Patients with schizophrenia show decreased contrast sensitivity across a range of grating sizes in behavioral studies.
“First, patients with schizophrenia show decreased contrast sensitivity (i.e., need more contrast to detect a grating) across a range of grating-sizes in behavioral studies (19,20).”
From Visual perception and its impairment in schizophrenia (2008) · cites this paper as [19]
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References 38 · Cited by 128
- Authors
- Kéri, S., Antal, A., Szekeres, G., Benedek, G., & Janka, Z.
- Affiliations
- University of Szeged (HU)
- Venue
- The Journal of Neuropsychiatry and Clinical Neurosciences
- Published
- 2002-05
- Volume
- 14
- Issue
- 2
- Pages
- 190-196
- ISSN
- 0895-0172 (ISSN-L)
- 1545-7222
- OpenAlex
- W2101839239
- Cited by
- 128
- References
- 38
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 7 · 2023: 3 · 2022: 6 · 2021: 8 · 2020: 7 · 2019: 6 · 2018: 1 · 2017: 5 · 2016: 4 · 2015: 7 · 2014: 7 · 2013: 9 · 2012: 4
- FWCI
- 2.99
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Neuropsychiatry (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Hallucinations in medical conditions
- Keywords
- schizophrenia, contrast sensitivity, extrapyramidal symptoms, antipsychotic drugs, hypodopaminergic state, Simpson-Angus Scale
- MeSH terms
- Adult, Humans, Brief Psychiatric Rating Scale, Perceptual Disorders, Random Allocation, Schizophrenia, Space Perception, Time Perception, Antipsychotic Agents, Visual Perception
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