Serotonin and dopamine as mediators of sensation seeking behavior.
- Authors
- Netter, P; Hennig, J; Roed, I S
- Year
- 1996
- Journal
- Neuropsychobiology
- PMID
- 8916073
- DOI
- 10.1159/000119318
The purpose of the present paper was to investigate the relationship of the serotonergic and dopaminergic systems to subscales of sensation seeking (SS). Two of the subscales, Disinhibition (DIS) and Experience Seeking (ES), were chosen for analysis based on their representation of the two major factors obtained in a factor analysis: DIS represents a factor of lack of impulse control and ES a factor of novelty seeking. In studies 1 and 2 responsivity to a serotonergic (5-HT) challenge by a 5-HT1a receptor agonist (ipsapirone) was investigated by drug-induced prolactin (PRL) and cortisol responses, as well as by emotional states and behavioral measures. The dopaminergic (DA) response to a DA agonist (lisuride) and antagonist (fluphenazine) was analyzed in a condition of smoking deprivation (study 3) using PRL responses, emotional states, and behavioral measures of nicotine craving as dependent variables. In the studies of the serotonergic system, high ES subjects showed a blunted cortisol response in both studies and high DIS subjects demonstrated a blunted PRL response in study 2. A frequently observed side effect of serotonergic agonists, increase in emotional arousal, was not observable with ipsapirone in high ES and high DIS subjects as compared to low scorers. Behavioral aggression, which had been experimentally induced in study 2, was increased in high ES as well as in high DIS by the 5-HT1a agonist which exerted antiaggressive effects in low scorers. These findings were found compatible with the idea of a generally low responsivity of the serotonergic system in high ES as well as in high DIS types of sensation seekers of 5-HT1a subsensitivity in high DIS and subsensitivity of other postsynaptic 5-HT receptors in high ES. There was no association between SS subscales and DA-induced decrease of PRL, but high ES subjects seemed to tolerate nicotine deprivation better than low ES subjects indicating that they were less susceptible to deprivation of nicotine-induced DA. But craving for nicotine was increased in high ES subjects by the DA agonist lisuride as opposed to the antagonist, which was taken as evidence that DA stimulation may induce approach behavior in high ES. Although only two subscales had been selected for the investigation, this approach suggests both common and different relationships between SS subscales and neurotransmitter systems.
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In this knowledge base
| Title | Year | PMID |
|---|---|---|
| Predicting sensation seeking from dopamine genes. A candidate-system approach. | 2010 | 20732903 |
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