Controlling the spotlight of attention: Visual span size and flexibility in schizophrenia
- 31 October 2011
- journal article
- Published by Elsevier BV in Neuropsychologia
- Vol. 49 (12), 3370-3376
- https://doi.org/10.1016/j.neuropsychologia.2011.08.011
Abstract
The current study investigated the size and flexible control of visual span among patients with schizophrenia during visual search performance. Visual span is the region of the visual field from which one extracts information during a single eye fixation, and a larger visual span size is linked to more efficient search performance. Therefore, a reduced visual span may explain patients' impaired performance on search tasks. The gaze-contingent moving window paradigm was used to estimate the visual span size of patients and healthy participants while they performed two different search tasks. In addition, changes in visual span size were measured as a function of two manipulations of task difficulty: target-distractor similarity and stimulus familiarity. Patients with schizophrenia searched more slowly across both tasks and conditions. Patients also demonstrated smaller visual span sizes on the easier search condition in each task. Moreover, healthy controls' visual span size increased as target discriminability or distractor familiarity increased. This modulation of visual span size, however, was reduced or not observed among patients. The implications of the present findings, with regard to previously reported visual search deficits, and other functional and structural abnormalities associated with schizophrenia, are discussed.Keywords
Funding Information
- NSERC
This publication has 39 references indexed in Scilit:
- Visual search performance among persons with schizophrenia as a function of target eccentricity.Neuropsychology, 2010
- Common Neural Circuitry Supporting Volitional Saccades and Its Disruption in Schizophrenia Patients and RelativesBiological Psychiatry, 2008
- Early-stage visual processing deficits in schizophreniaCurrent Opinion in Psychiatry, 2005
- Control of goal-directed and stimulus-driven attention in the brainNature Reviews Neuroscience, 2002
- Dysfunction of Early-Stage Visual Processing in SchizophreniaAmerican Journal of Psychiatry, 2001
- Eye movements and the span of the effective stimulus in visual searchPerception & Psychophysics, 2000
- Effects of similarity and history on neural mechanisms of visual selectionNature Neuroscience, 1999
- Motion Perception in SchizophreniaArchives of General Psychiatry, 1999
- Visual search and stimulus similarity.Psychological Review, 1989
- Attention in SchizophreniaThe Journal of Nervous and Mental Disease, 1981