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Spontaneous selective attention in schizophrenia.

M Myles-Worsley¹, W A Johnston, P H Wender

¹Dept. of Psychiatry, University of Utah School of Medicine, Salt Lake City 84132.

Psychiatry Research

|November 1, 1991

Summary

Schizophrenic patients show abnormal selective attention, focusing more on predictable information than controls. This indicates altered information processing, not a slower rate, in schizophrenia.

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Area of Science:

Cognitive Psychology
Neuroscience
Psychiatry

Background:

Selective attention is crucial for processing information when multiple stimuli are present.
Understanding attentional mechanisms in psychiatric disorders like schizophrenia is vital for diagnosis and treatment.
Previous research suggests potential attentional deficits in schizophrenia, but the nature of these deficits requires further clarification.

Purpose of the Study:

To investigate spontaneous selective attention in schizophrenic patients compared to manic-depressive patients and normal controls.
To examine how predictability influences selective attention in these groups.
To determine if observed differences in attention reflect information processing rate or attentional control.

Main Methods:

A visual word identification task involving simultaneous word presentation was employed.
Participants identified upper or lower words under divided and selective attention conditions.
Predictability was introduced to assess spontaneous attentional shifts.

Main Results:

Schizophrenic patients demonstrated normal accuracy in word identification, suggesting no deficit in information processing rate.
Schizophrenic patients exhibited abnormal selective attention, over-attending to predictable stimuli.
A significant proportion of schizophrenic patients (85%) showed abnormal selective attention ratios compared to manic-depressive patients (30%) and controls (20%).

Conclusions:

Schizophrenia is associated with abnormal spontaneous selective attention, characterized by an over-reliance on predictable information.
Attentional abnormalities in schizophrenia may involve altered attentional control rather than deficits in information processing speed.
These findings contribute to understanding the cognitive underpinnings of schizophrenia and may inform future therapeutic strategies.

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