John A. Assad

This study shows dopamine reward transients rapidly recalibrate movement timing through one-shot updates to behavioral vigor, revealing a mechanism linking dopamine's roles in reinforcement, motivation, and movement.

The paper investigates neuronal activity in the substantia nigra pars reticulata during movement and finds that most neurons show congruent modulation across competing actions, challenging the action-selection hypothesis.

This study shows dopamine signals modulate subjective time speed during interval timing, supporting a unified theory of reinforcement learning and timing.

This study shows that dynamic dopamine signaling over seconds predicts movement initiation timing in mice by modulating the probability of movement on a trial-by-trial basis.

This paper introduces an integrated fibertrode that enables simultaneous optogenetic control and electrical recording of neural activity in small brain volumes with reduced photoelectric artifacts.