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Autonomic activity in boys with disruptive behavior disorders
1Laboratory of Psychology and Psychopathology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892.
Psychophysiology
|November 1, 1993
Summary
Boys with disruptive behavior disorder exhibit distinct physiological responses, including higher resting heart rate (HR) and altered skin conductance (SC) reactivity, compared to controls. These findings support the validity of the disruptive behavior disorder spectrum.
Area of Science:
- Psychophysiology
- Neurodevelopmental Disorders
- Behavioral Science
Background:
- Disruptive behavior disorder (DBD) is a spectrum of conditions affecting children and adolescents.
- Autonomic nervous system (ANS) functioning is often implicated in behavioral disorders.
- Previous research on ANS activity in DBD has yielded mixed results.
Purpose of the Study:
- To investigate differences in autonomic nervous system (ANS) activity between boys with disruptive behavior disorder (DBD) and typically developing controls.
- To explore variations in ANS responsivity within the DBD spectrum based on diagnostic subtypes and behavioral characteristics.
- To examine the relationship between physiological measures and specific behaviors like aggression and impulsivity in DBD.
Main Methods:
- Measured skin conductance (SC) and heart rate (HR) in 34 boys with DBD and 33 control boys.
- Assessed physiological responses during rest, auditory stimuli (tones), and a reaction time task.
- Analyzed differences in resting levels, response magnitude, habituation rates, and response latencies.
Main Results:
- Boys with DBD had higher resting heart rate (HR) than controls, particularly those without conduct disorder.
- Disruptive boys showed a smaller increase in skin conductance (SC) response frequency to task instructions.
- While not showing a general deficit in SC reactivity, disruptive boys habituated faster to stimuli and had shorter SC response latencies despite slower motor reaction times.
Conclusions:
- The findings do not support a hypothesis of generally low autonomic nervous system (ANS) baselines in disruptive boys but suggest potentially diminished ANS reactivity.
- Physiological responsivity did not significantly differ between DBD subtypes (with or without conduct disorder).
- Individual differences within the DBD spectrum may be better understood through behavioral dimensions (aggression, impulsivity) rather than conventional diagnostic subcategories.