The Selective Dopamine D2 Blocker Sulpiride Modulates the Relationship Between Agentic Extraversion and Executive...

Area of Science:

• Neuroscience
• Psychology
• Pharmacology

Background:

• Agentic extraversion and executive functions (EF) are hypothesized to be linked via dopamine (DA) system influences.
• Previous research suggests an association, but specificity to particular EFs or shared task variance remains unclear.

Purpose of the Study:

• To investigate the DA-related relationship between agentic extraversion and two EF tasks (3-back and switching).
• To determine if this association is modulated by dopamine D2 receptor blockade with sulpiride.
• To ascertain if effects are attributable to shared or specific variance within EF tasks.

Main Methods:

• A placebo-controlled, between-group design was employed with 92 female volunteers.
• Participants received either sulpiride (200 mg) or a placebo.
• Agentic extraversion and performance on 3-back and switching tasks were assessed.

Main Results:

• A significant interaction between drug condition and agentic extraversion was observed for both EF tasks, supporting the dopamine theory of extraversion.
• Univariate analyses showed a similar interaction on two of three performance measures.
• The effect was attenuated when controlling for shared task variance, indicating partially shared DA-based processes.

Conclusions:

• The findings support a DA-mediated link between agentic extraversion and executive functions.
• Results suggest that shared variance and task reliability are crucial considerations in EF research.
• Dopamine-based processes appear to underlie the association between agentic extraversion and executive functions.