Dopaminergic D₁ Receptor Stimulation Affects Effort and Risk Preferences

Area of Science:

• Neuroscience
• Pharmacology
• Decision Science

Background:

• D1 receptor activation is linked to goal-directed behavior.
• The causal impact of D1 receptor activation on human cost-benefit decision-making remains unclear.
• This study investigates D1 receptor stimulation's effect on risk, delay, and effort costs.

Purpose of the Study:

• To determine if D1 receptor stimulation causally affects human cost-benefit decision-making.
• To examine the specific impact of D1 receptor stimulation on sensitivity to risk, delay, and effort costs.
• To assess if D1 receptor stimulation biases choices toward options with increased costs.

Main Methods:

• A randomized, double-blind, placebo-controlled, parallel-group phase 1 study.
• 120 healthy young volunteers received placebo or one of three doses of a selective D1 agonist (PF-06412562).
• Participants completed decision tasks assessing preferences for risky, delayed, and effortful outcomes post-drug administration.

Main Results:

• Higher doses of the D1 agonist increased willingness to exert physical effort for reward.
• D1 receptor stimulation reduced preference for risky outcomes.
• No significant effects were observed on preferences for delayed rewards.

Conclusions:

• D1 receptor stimulation causally influences core aspects of cost-benefit decision-making in humans.
• The findings highlight the role of D1 receptors in modulating effort and risk preferences.
• This research provides a causal link between D1 receptor activity and economic choices.