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Heightened motor activity level in male offspring of substance abusing fathers
H B Moss1, T C Blackson, C S Martin
1Center for Education and Drug Abuse Research, University of Pittsburgh School of Medicine, PA 15213.
Insights
Boys with fathers who have substance abuse issues exhibit higher motor activity, especially during challenging tasks. This heightened activity may indicate a susceptibility to substance abuse later in life.
Area of Science:
- Neuroscience
- Developmental Psychology
- Genetics
Background:
- Substance abuse is linked to high activity levels, but this connection hasn't been studied in young boys at risk.
- Understanding early behavioral markers can help identify individuals susceptible to substance abuse.
Purpose of the Study:
- To investigate motor activity differences in prepubertal boys with and without a high risk for substance abuse.
- To explore the relationship between motor activity, temperament, psychiatric status, and substance abuse risk.
Main Methods:
- Assessed motor activity using microprocessor-based monitors in 10-12 year-old sons of substance-abusing fathers (SA+) and controls (SA-).
- Measured activity during low-demand and high-demand tasks requiring concentration, effort, and behavioral suppression.
- Collected data on psychiatric status, temperament traits, and internalizing/externalizing behaviors.
Main Results:
- SA+ boys showed significantly greater motor activity than SA- boys during high-demand tasks.
- Anxiety disorders predicted activity under low-demand conditions.
- Under high-demand conditions, SA+ group membership and low rhythmicity predicted heightened activity.
Conclusions:
- Heightened motor activity, particularly during effortful tasks, may be an early indicator of substance abuse susceptibility.
- Temperament traits like rhythmicity and psychiatric status interact with risk factors for substance abuse.
Abstract:
Heightened activity level has been implicated in the liability for substance abuse, but no prior research has directly examined motor activity in a sample of prepubertal boys at high-risk for substance abuse. The magnitude of behavioral activity of 10-12 year-old sons of substance abusing fathers (SA +) (n = 42) and controls (SA -) (n = 60) was assessed using a microprocessor-based activity monitor during tasks that demanded significant concentration, effort, and constraint on motor activity, and when no such demands were present. Psychiatric status, measures of temperament traits, and measures of internalizing and externalizing behaviors were also obtained on the boys. Although the groups did not differ during the lower demand task, SA + boys showed significantly greater motor activity than SA - boys during the tasks that required concerted effort, attention, and behavioral suppression. Multiple regression analysis indicated that under the low-demand condition, the presence of an anxiety disorder in the boy was the only significant predictor of activity level. However, under the conditions that demanded effort, concerted attention and behavioral suppression, SA + group membership, and having low rhythmicity (as a temperament trait) predicted heightened activity. Statistically controlling for rhythmicity, the SA + boys were estimated to have about 24% higher activity than control boys. The results suggest that heightened motor activity may be associated with susceptibility to substance abuse.