title: Eye movements during natural actions in patients with schizophrenia.
abstract: BACKGROUND
  Visual scanning and planning of actions are reported to be abnormal in patients with schizophrenia. Most studies that monitored eye movements in these patients were performed under free-viewing conditions and used 2- dimensional images. However, images differ from the natural world in several ways, including task demands and the dimensionality of the display. Our study was designed to assess whether abnormalities in visual exploration in patients with schizophrenia generalize to active-viewing tasks in realistic conditions of viewing and to examine whether disturbances in action sequencing in these patients are reflected in their visual scanning patterns while executing natural tasks.
  
  
  METHODS
  We monitored visual scan paths in patients with schizophrenia and healthy controls. Participants performed several tasks in which they were asked to look at a realistic scene on a table (free-viewing) and perform 2 active-viewing tasks: a familiar task (sandwich-making) and an unfamiliar task (model-building). The scenes contained both task-relevant and task-irrelevant objects.
  
  
  RESULTS
  We included 15 patients and 15 controls in our analysis. Patients exhibited abnormalities in the free-viewing condition. Their patterns of exploration were similar to those of controls in the familiar task, but they showed scanning differences in the unfamiliar task. Patients were also slower than controls to accomplish both tasks.
  
  
  CONCLUSIONS
  Patients with schizophrenia were taking antipsychotic medications, so the presence of medication effects cannot be excluded.
  
  
  CONCLUSIONS
  People with schizophrenia present a basic psychomotor slowing and seem to establish a less efficient planning strategy in the case of more complex and unfamiliar tasks.
authors.affiliation: Laboratoire de Neurosciences Fonctionnelles et Pathologies, Université Lille - Nord de France, CNRS, Lille, France. celine.b.delerue@wanadoo.fr
authors.forename: Céline
authors.initials: C
authors.lastname: Delerue
authors.forename: Mary
authors.initials: M
authors.lastname: Hayhoe
authors.forename: Muriel
authors.initials: M
authors.lastname: Boucart
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology*; D021641:Recognition, Psychology / Q000502:physiology; D012559:Schizophrenia / Q000503:physiopathology*
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