Drug-produced changes in human social behavior: facilitation by d-amphetamine

Area of Science:

• Behavioral Pharmacology
• Psychopharmacology
• Human Social Behavior Research

Background:

• Understanding the behavioral effects of stimulant medications like d-amphetamine is crucial for therapeutic applications and research.
• Naturalistic human behaviors such as socializing and speaking offer potential as sensitive measures in pharmacological studies.

Purpose of the Study:

• To investigate the dose-dependent effects of oral d-amphetamine on human social and verbal behavior.
• To explore the reliability of behavioral measures versus self-report in assessing stimulant drug effects.
• To examine potential indirect, socially mediated drug effects on interacting partners.

Main Methods:

• Employed a time-sampling observation procedure in a residential research ward to assess social behavior.
• Utilized throat microphones and voice-operated relays for quantitative measurement of dyadic verbal interactions.
• Administered d-amphetamine at doses ranging from 5-30 mg and included placebo controls.

Main Results:

• d-Amphetamine increased socializing in all subjects and speaking time in 5 out of 7 subjects in a dose-related manner.
• Self-report scores on an adjective checklist were as sensitive as speaking time measures.
• Increased speaking time was observed in placebo-receiving partners of d-amphetamine-treated subjects, indicating a socially mediated effect.

Conclusions:

• Naturalistic behaviors like socializing and speaking are sensitive and reliable dependent variables for behavioral pharmacology research.
• d-Amphetamine exerts direct dose-related effects on social and verbal behavior and can indirectly influence the behavior of social partners.
• Both direct behavioral observation and self-report measures are effective in detecting stimulant drug effects.