John G. Mikhael

Dopamine mediates the bidirectional update of interval timing

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

The Role of State Uncertainty in the Dynamics of Dopamine

This study shows that sensory feedback causes dopamine to ramp up before reward, challenging conventional models and supporting the reward prediction error hypothesis through experimental and theoretical analysis.

Impulsivity and risk-seeking as Bayesian inference under dopaminergic control

The paper uses a Bayesian model to show how dopaminergic control influences impulsivity and risk-seeking in intertemporal choice and probability discounting tasks.

Rational Inattention and Tonic Dopamine

This paper introduces the concept of rational inattention to reconcile two theories of tonic dopamine's role in reinforcement learning and interval timing, showing how DA balances cognitive costs and reward availability.

A unified framework for dopamine signals across timescales

This study demonstrates that ramping dopamine signals correspond to reward prediction errors rather than state values, unifying rapid phasic and slow ramping signals as derivative-like computations.