Abstract
Rationale
Platelet monoamine oxidase (MAO) activity reflects serotonergic functioning associated with impulsive behaviour, but the significance of these associations to real-life impulsive behaviour in healthy subjects is not clear.
Objectives
The present study explores impulsivity and platelet MAO activity among people with driving violations.
Materials and methods
We compared facets of impulsivity and platelet MAO activity in 1,004 male drivers, out of whom 203 had been caught by the police driving drunk and 292 had been caught exceeding speed limits and committing other non-alcohol-related driving violations. Subjects with speeding and other non-alcohol-related violations were further divided according to their self-reported risk-admitting of exceeding speed limits.
Results
While drunk driving was associated only with maladaptive types of impulsivity, exceeding speed limits was associated with functional impulsivity and excitement seeking and, to a lesser degree, with dysfunctional impulsivity. Drunk drivers had lower platelet MAO activity. Risk-admitting high-risk drivers had higher platelet MAO activity, neuroticism-related impulsivity, dysfunctional impulsivity and excitement seeking compared to all other groups and higher functional impulsivity compared to controls. Risk-denying high-risk drivers had only higher functional impulsivity compared to controls.
Conclusions
This study demonstrates different expressions of functional and dysfunctional impulsivity in behaviour. While platelet MAO activity is lower in alcohol-related risky behaviour, non-alcohol-related self-acknowledged risky behaviour is related to higher platelet MAO activity. Thus, deviance towards lower as well as higher end of central serotonergic functioning may lead to impulsive behaviour. While self-reported impulsivity did not correlate with MAO activity, both MAO activity and impulsivity were related to risky behaviour.
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Acknowledgements
This research was supported by the Estonian Science Foundation (grant 5450), the Estonian Ministry of Education and Science (grant 2643), and the Estonian Road Administration (grants LSOPH01030 and LSOPH02038). Marika Paaver was a scholarship holder of the World Federation of Scientists during the period of the study. We are thankful to Dr Toomas Ernits for organisational assistance and Krista Fischer, Ph.D. for statistical advice. The research complies with the current laws in Estonia.
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Paaver, M., Eensoo, D., Pulver, A. et al. Adaptive and maladaptive impulsivity, platelet monoamine oxidase (MAO) activity and risk-admitting in different types of risky drivers. Psychopharmacology 186, 32–40 (2006). https://doi.org/10.1007/s00213-006-0325-3
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DOI: https://doi.org/10.1007/s00213-006-0325-3