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Reduced attention-related negative potentials in schizophrenic children
R J Strandburg1, J T Marsh, W S Brown
1Dept. of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles.
Electroencephalography and Clinical Neurophysiology
|October 1, 1991
Summary
Schizophrenic children show reduced attentional effort during visual processing tasks. This deficit in endogenous negativity, observed early in discriminative processing, suggests impaired allocation of attentional resources in schizophrenia.
Area of Science:
- Neuroscience
- Child Psychology
- Psychiatric Disorders
Background:
- Schizophrenia is associated with cognitive deficits, including attentional impairments.
- Event-related potentials (ERPs) offer insights into neural processing in psychiatric conditions.
- The span of apprehension task is sensitive to vulnerability factors in schizophrenia.
Purpose of the Study:
- To investigate attentional resource allocation in children with schizophrenia using ERPs.
- To compare endogenous brain activity between normal and schizophrenic children during visual tasks.
Main Methods:
- ERPs were recorded from normal and schizophrenic children during reaction time (RT) and span of apprehension (Span) tasks.
- EEG was captured at 19 scalp sites.
- Difference potentials (Span-RT) isolated endogenous activity related to Span task demands.
Main Results:
- Schizophrenic children exhibited a significantly smaller increase in endogenous negative activity compared to controls.
- This endogenous negativity differed in topography and time course from exogenous ERP components.
- The findings suggest impaired attentional effort in processing complex visual stimuli.
Conclusions:
- Children with schizophrenia demonstrate deficits in allocating adequate attentional resources.
- This impairment in attentional processing is evident early in discriminative stages.
- ERPs reveal early-stage cognitive differences in pediatric schizophrenia.