David Mathar

This study investigates how dopamine levels affect exploration-exploitation behavior in humans, finding that cognitive capacity and sex moderate L-DOPA effects on decision-making.

This study shows that Tyrosine supplementation improves reinforcement learning by stabilizing choice behavior and increasing value-driven exploitation in a gender-balanced sample.

The paper re-examines the pharmacological effects of L-DOPA on temporal discounting in a large sample and evaluates proxy measures for dopamine, finding a reliable reduction in discount rate with no credible effects from proxy measures.

This study investigates reduced model-based control in gambling disorder using reinforcement learning tasks, computational modeling, and fMRI, finding intact neural representations of task structure despite behavioral impairments.

The paper extends a hybrid RL model with a heuristic-based exploration mechanism to analyze two-step sequential decision tasks, finding it better explains choice probabilities in stage one.

The paper examines how erotic cues affect physiological arousal, reward discounting, and model-based reinforcement learning in healthy males.

The paper examines how exposure to appetitive cues affects temporal discounting and neural reward responses in humans, finding no significant effect on discounting despite increased neural activity.

This study investigates dopamine's role in human reinforcement learning using pharmacological interventions and fMRI, finding reduced decision thresholds under dopaminergic manipulations.

The paper evaluates parameter and model recovery of the Kalman SMEP reinforcement learning model in restless bandit tasks using simulation and Bayesian inference.

This study examines the effects of a single dose of tyrosine on decision-making tasks and physiological arousal, finding reduced response times and altered temporal discounting.

This study examines the effects of virtual gambling environments on problem gamblers and controls, finding increased physiological arousal but no substantial behavioral or physiological changes beyond craving.

This study investigates how dopamine affects the exploration-exploitation trade-off in human decision-making using computational modeling, pharmacology, and fMRI.

This study examines spontaneous eye blink rates in gamblers and controls to assess links to dopamine levels and addiction severity, finding no difference between groups but associations within gamblers.