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Cited by 46Schizophrenia research and treatmentVisual perception and processing mechanismsHallucinations in medical conditions

Perceptual organization by proximity and similarity in schizophrenia

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Kurylo, Daniel D., Pasternak, Roey, Silipo, Gail, Javitt, Daniel C., Butler, Pamela D.·2007·Schizophrenia Research
DOI 10.1016/j.schres.2007.07.001PMC PMC2000474
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Abstract

Perceptual organization represents a basic and essential function that occurs at an intermediate level of visual processing. Much of the previous research on perceptual organization in schizophrenia employed indirect measurements, or included factors beyond sensory processing. The aims of the present study were to determine the integrity of perceptual organization in schizophrenia, as well as to determine the stimulus duration necessary to perform perceptual organization. Psychophysical measurements were compared between patients with schizophrenia and matched control subjects. Participants viewed dot patterns briefly presented on a computer monitor, and indicated whether stimuli appeared grouped as vertical or horizontal lines. Grouping was based upon either relative proximity or similarity in color. Across trials, relative proximity or color similarity was progressively reduced until stimuli became bi-stable (perceived as either of two patterns of grouping), establishing the grouping threshold. In separate conditions, stimuli were immediately followed by a mask to limit processing. Stimulus duration was progressively reduced until stimuli became bi-stable, establishing the critical stimulus duration (CSD). Schizophrenia patients demonstrated elevated grouping thresholds for grouping by proximity as well as color similarity. In addition, CSD was significantly extended for the schizophrenia group, with a nearly four-fold increase in duration of processing. These results provide direct evidence of impairment in schizophrenia for perceptual organization based upon spatial relationships and feature similarity, and suggest deficits in low-level perceptual organization processes. Although this study did not directly investigate the physiological correlates underlying perceptual impairments, these results are consistent with a theory of impaired lateral connections within visual cortical areas in schizophrenia.

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  • Deficits in object recognition, grouping, perceptual closure, face processing, and reading occur in schizophrenia.

    “These include deficits in object recognition, grouping, perceptual closure, face processing, and reading (54–62).”

    From Visual perception and its impairment in schizophrenia (2008) · cites this paper as [55]

  • There are numerous examples of poor form processing in schizophrenia that would seem to directly implicate integration deficits.

    “There are numerous examples of poor form processing in schizophrenia that would seem to directly implicate integration deficits.”

    From Visual perception and its impairment in schizophrenia (2008) · cites this paper as [55]

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Authors
Kurylo, D. D., Pasternak, R., Silipo, G., Javitt, D. C., & Butler, P. D.
Affiliations
  • Brooklyn College (US)
  • Nathan Kline Institute for Psychiatric Research (US)
Corresponding author
Kurylo, Daniel D.
ORCID
Venue
Schizophrenia Research
Publisher
Elsevier BV
Published
2007-09
Volume
95
Issue
1-3
Pages
205-214
ISSN
0920-9964 (ISSN-L)
DOI
10.1016/j.schres.2007.07.001
PMC
PMC2000474
OpenAlex
W2089774266
Cited by
46
References
54
Citations by year
2026: 2 · 2025: 3 · 2024: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 2 · 2016: 1 · 2015: 3 · 2014: 4 · 2013: 5 · 2012: 4
FWCI
1.81
Type
journal article
Language
en
Open access
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Schizophrenia Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Mental Health (R37MH049334, R37MH49334, R01MH066374, K02-MH-01439, R01 MH66374, K02MH001439)
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
perceptual organization, schizophrenia
MeSH terms
Adult, Color Perception, Cues, Discrimination, Psychological, Distance Perception, Female, Humans, Male, Pattern Recognition, Visual, Perceptual Masking, Photic Stimulation, Reaction Time, Schizophrenia, Schizophrenic Psychology, Visual Cortex, Visual Pathways, Visual Perception

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