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Mixing apples with oranges: Visual attention deficits in schizophrenia
Claudia Caprile1, Jorge Cuevas-Esteban2, Susana Ochoa3
1Fundació Sant Joan de Déu, Parc Sanitari de Sant Joan de Déu, Esplugues de Llobregat, Barcelona, Spain; Departament de Psicologia Bàsica, Universitat de Barcelona, Barcelona, Spain.
Journal of Behavior Therapy and Experimental Psychiatry
|February 14, 2015
Summary
Individuals with schizophrenia exhibit attention deficits in filtering visual information, particularly when irrelevant stimuli are present. These difficulties correlate with positive symptoms, suggesting a link between visual attention and symptom severity.
Area of Science:
- Cognitive Neuroscience
- Psychiatry
Background:
- Schizophrenia is frequently associated with cognitive impairments.
- Visual selective attention deficits may contribute to these cognitive deficits.
Purpose of the Study:
- To investigate visual information filtering anomalies in schizophrenia.
- To explore the relationship between these anomalies and clinical symptoms.
Main Methods:
- A Garner task was used with individuals with schizophrenia and healthy controls.
- Participants performed visual classification tasks involving separable (color/shape) and integral (width/height) dimensions.
- Reaction times were measured to assess filtering efficiency.
Main Results:
- Schizophrenia patients showed increased reaction times when ignoring irrelevant shape information (Experiment 1).
- Both groups were affected by irrelevant height information, but schizophrenia patients exhibited a larger interference effect (Experiment 2).
- Filtering deficits correlated with positive symptoms on the PANSS scale.
Conclusions:
- Schizophrenia patients have deficits in filtering irrelevant visual information.
- These attention deficits are linked to positive symptomatology in schizophrenia.
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