Document Detail

Prolonged temporal interaction for peripheral visual processing in schizophrenia: Evidence from a three-flash illusion.
MedLine Citation:
PMID:  24814873     Owner:  NLM     Status:  Publisher    
BACKGROUND: Coherent perception of the visual world requires orderly processing of spatially and temporally distributed visual information across the visual field. The organization of this visual information is impaired in schizophrenia. We previously found that visual temporal integration in patients is prolonged, using flashes presented to the central fovea. In this study, we investigated this temporal interaction in both the fovea and fairly far out in the peripheral visual field.
METHODS: We used a 'three-flash' illusion paradigm in which two spatially-coincident light pulses (of 1ms each) are perceived by healthy individuals as one, two or three flashes depending on the time interval between the pulses. In each trial, two light pulses were presented in the fovea or 34° out in the right visual field. The inter-stimulus pulse interval (ISI) ranged from 30 to 310ms. The task for patients (n=28) and controls (n=26) was to indicate the number of flashes (one, two or three) perceived after each two-pulse presentation.
RESULTS: For the controls, the peak of the three-flash illusion was shifted to longer ISIs (150ms) in the periphery compared to the fovea (110ms). For the patients, the three-flash illusion was greater and occurred at longer ISIs (270ms in the periphery and 190ms at the fovea).
CONCLUSION: Compared to the central visual field, the range of temporal interactions in the periphery is prolonged to a greater extent in schizophrenia. This exacerbated temporal expansion in peripheral vision suggests a coarse temporal resolution for visual and cognitive organization in this mental disorder.
Yue Chen; Daniel Norton; Charles Stromeyer
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-5-8
Journal Detail:
Title:  Schizophrenia research     Volume:  -     ISSN:  1573-2509     ISO Abbreviation:  Schizophr. Res.     Publication Date:  2014 May 
Date Detail:
Created Date:  2014-5-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804207     Medline TA:  Schizophr Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier B.V. All rights reserved.
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