Abstract
Background: Visual scanpath analyses provide important information about attention allocation and attention shifting during visual exploration of social situations. This study investigated whether patients with schizophrenia simply show restricted free visual exploration behavior reflected by reduced saccade frequency and increased fixation duration or whether patients use qualitatively different exploration strategies than healthy controls.Methods: Scanpaths of 32 patients with schizophrenia and age-matched 33 healthy controls were assessed while participants freely explored six photos of daily life situations (20 s/photo) evaluated for cognitive complexity and emotional strain. Using fixation and saccade parameters, we compared temporal changes in exploration behavior, cluster analyses, attentional landscapes, and analyses of scanpath similarities between both groups.Results: We found fewer fixation clusters, longer fixation durations within a cluster, fewer changes between clusters, and a greater increase of fixation duration over time in patients compared to controls. Scanpath patterns and attentional landscapes in patients also differed significantly from those of controls. Generally, cognitive complexity and emotional strain had significant effects on visual exploration behavior. This effect was similar in both groups as were physical properties of fixation locations.Conclusions: Longer attention allocation to a given feature in a scene and less attention shifts in patients suggest a more focal processing mode compared to a more ambient exploration strategy in controls. These visual exploration alterations were present in patients independently of cognitive complexity, emotional strain or physical properties of visual cues implying that they represent a rather general deficit. Despite this impairment, patients were able to adapt their scanning behavior to changes in cognitive complexity and emotional strain similar to controls.
Highlights
Deficits in the perception of social situations are suggested to underlie impaired social interaction in patients with schizophrenia (Addington et al, 2006)
Scanpaths of patients with schizophrenia and age-matched healthy controls were assessed while participants freely explored six photos of daily life situations (20 s/photo) evaluated for cognitive complexity and emotional strain
Longer attention allocation to a given feature in a scene and less attention shifts in patients suggest a more focal processing mode compared to a more ambient exploration strategy in controls. These visual exploration alterations were present in patients independently of cognitive complexity, emotional strain or physical properties of visual cues implying that they represent a rather general deficit
Summary
Deficits in the perception of social situations are suggested to underlie impaired social interaction in patients with schizophrenia (Addington et al, 2006). A visual scanpath constitutes a sequence of voluntary saccades each shifting the focus of attention from one location of interest to the thereby tracing the direction and extent of gaze when a subject extracts information from complex visual scenes (Noton and Stark, 1971). Some analyses focused on comparisons of quantitative eye-movement parameters, e.g., saccade frequency and amplitude (Phillips and David, 1997; Streit et al, 1997; Benson et al, 2007) Such studies have revealed restricted visual scanpaths in patients compared to www.frontiersin.org. This study investigated whether patients with schizophrenia show restricted free visual exploration behavior reflected by reduced saccade frequency and increased fixation duration or whether patients use qualitatively different exploration strategies than healthy controls
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