Prolonged temporal interaction for peripheral visual processing in schizophrenia: Evidence from a three-flash illusion
| Autor: | Charles F. Stromeyer, Daniel J. Norton, Yue Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Adult
Male medicine.medical_specialty Fovea Centralis Visual perception Time Factors media_common.quotation_subject Illusion Audiology Article Visual processing Gaze-contingency paradigm Visual memory medicine Psychophysics Humans Biological Psychiatry media_common Analysis of Variance Illusions Visual field Psychiatry and Mental health Peripheral vision Time Perception Schizophrenia Visual Perception Female Schizophrenic Psychology Visual Fields Psychology N2pc Photic Stimulation Cognitive psychology |
| Popis: | article i nfo 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 presentedto the centralfovea.In thisstudy,we investigatedthistemporal interaction inboththefovea andfairly far out in the peripheral visual field. Methods: We used a 'three-flash' illusion paradigm in which two spatially-coincident light pulses (of 1 ms 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 310 ms. 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 (150 ms) in the periphery compared to the fovea (110 ms). For the patients, the three-flash illusion was greater and occurred at longer ISIs (270 ms in the periphery and 190 ms 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|