Methylphenidate undermines or enhances divergent creativity depending on baseline dopamine synthesis capacity

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychopharmacology

Background:

• Psychostimulants like methylphenidate are anecdotally linked to reduced creativity.
• Previous research is inconclusive due to small sample sizes and lack of individual variability consideration.

Purpose of the Study:

• To definitively assess methylphenidate's impact on creative thinking.
• To investigate the role of baseline dopamine synthesis capacity in this effect.
• To differentiate effects on convergent versus divergent thinking.

Main Methods:

• 90 healthy participants in a double-blind, within-subject design.
• Administered methylphenidate, placebo, or sulpiride (D2 antagonist).
• Assessed convergent and divergent thinking tasks, with dopamine capacity measured via 18F-FDOPA PET.

Main Results:

• Methylphenidate did not significantly alter overall divergent or convergent thinking.
• Exploratory analysis revealed a dopamine-dependent effect on response divergence (variability).
• Methylphenidate reduced response divergence in low-dopamine individuals but enhanced it in high-dopamine individuals.

Conclusions:

• Methylphenidate's effect on creativity is nuanced and depends on individual dopamine levels.
• Low baseline dopamine synthesis capacity may be a vulnerability factor for methylphenidate impairing divergent creativity.
• No significant effects were observed for sulpiride.