John P Grogan

Distinguishing evidence accumulation from choice confidence in neural signatures of perceptual decision making

This study investigates whether the centro-parietal positivity (CPP) reflects evidence accumulation or subjective confidence during perceptual decision-making, finding that CPP is an evidence accumulation signal, not confidence.

Neural dynamics of covert habit activation and control in humans

This study uses EEG to investigate covert habit activation and control in humans, finding that the lateralized readiness potential tracks habitual responses and frontal midline theta power scales with habit override.

A single evidence accumulation process informs perceptual choices and subsequent confidence reports

The paper develops a model showing that choice and confidence reports share a single evidence accumulation process with separate boundaries.

Muscarinic receptors mediate motivation via preparatory neural activity in humans

This study shows that muscarinic receptors enhance motivation-related preparatory neural activity in humans, as evidenced by changes in reaction times and vigour during an incentivized task.

Confidence is predicted by pre- and post-choice decision signal dynamics

The paper examines how pre- and post-choice neural signals relate to confidence in perceptual decisions, finding that post-choice evidence accumulation continues and is influenced by confidence levels.

Dopamine promotes instrumental motivation, but reduces reward-related vigour

This study investigates how dopamine affects two types of motivation in Parkinson's disease patients, finding that dopamine enhances contingent reward motivation but reduces reward-driven vigour.

Dopamine-gated memory selection during slow wave sleep

This study investigates how dopamine affects memory consolidation during sleep, finding that it enhances forgetting of weak memories and increases slow wave sleep duration.

Effects of Parkinson’s disease and dopamine on digit span measures of working memory

This study investigates how Parkinson’s disease and dopamine affect working memory by testing digit span tasks in patients and healthy controls with and without medication.

Levodopa’s effects on expression of reinforcement learning

This study investigates levodopa's effect on choice performance in reinforcement learning, finding no impact on accuracy or expression of reinforced values.