David M. Christmas

This study investigates how cortical dopamine affects motivational biases in automated behavior using a pharmacological intervention in healthy individuals.

This study shows that serotonin depletion impairs reversal learning and emotional updating in humans, correlating with the degree of tryptophan depletion.

The paper was withdrawn due to substantial changes in results and interpretation after further analysis.

The paper shows that serotonin depletion enhances emotional responses to social conflict, interacting with personality traits to produce distinct emotions like guilt and annoyance.

This study examines how tryptophan depletion affects conditioned threat memory and finds that serotonin reduction attenuates emotional memory expression, particularly in individuals with higher intolerance of uncertainty.