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Schizophrenia and affective disorder show different visual scanning behavior for faces: a trait versus state-based
Carmel M Loughland1, Leanne M Williams, Evian Gordon
1Brain Dynamics Centre, Westmead Hospital, and Department of Psychology, University of Sydney, Australia.
Biological Psychiatry
|September 5, 2002
Summary
Visual scanpath abnormalities in schizophrenia are specific to the disorder, unlike affective disorder which shows attentional disturbances. This restricted visual scanning may serve as a trait marker for schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Schizophrenia is associated with impaired social cognition, potentially linked to abnormal visual processing of faces.
- Previous research suggests atypical visual scanpaths in schizophrenia, but specificity to the disorder was unexamined.
Purpose of the Study:
- To investigate the specificity of visual scanpath impairments in schizophrenia.
- To differentiate visual scanning patterns between schizophrenia, affective disorder, and healthy controls.
Main Methods:
- Compared visual scanpath performance in 65 schizophrenia, 52 affective disorder, and 61 control participants.
- Two experiments assessed face recognition (neutral faces) and facial affect recognition (happy, sad, neutral emotions).
- Behavioral tasks involved matching faces or expressions under varying multiple-choice conditions.
Main Results:
- Schizophrenia patients exhibited a restricted visual scanpath style across all facial stimuli.
- Schizophrenia patients showed significant recognition deficits, especially for neutral and happy faces.
- Affective disorder patients differed from schizophrenia patients in scanpath parameters, showing attentional issues with degraded faces.
Conclusions:
- A global restriction of visual scanpaths appears specific to schizophrenic psychosis and may be a trait marker.
- Scanpath abnormalities in affective disorder may indicate state-dependent attentional disturbances rather than a trait marker.