Reward Anticipation Dynamics during Cognitive Control and Episodic Encoding: Implications for Dopamine

Chiew, Kimberly S.; Stanek, Jessica K.; Adcock, R. Alison · 2016 · OpenAlex-citations

DOI: 10.3389/fnhum.2016.00555

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Summary

This perspective article synthesizes findings from two empirical studies to characterize how the temporal dynamics of dopamine (DA) modulation influence cognitive control and episodic memory. The authors address the gap in understanding how distinct DA firing patterns—specifically phasic bursts versus prolonged ramping activity—support goal-directed behavior across different cognitive domains. While phasic DA is well-established in signaling reward prediction errors, the functional role of ramping DA, which scales with reward uncertainty and proximity to reward, remains debated. The paper argues that examining reward anticipation timing can help dissociate these dynamics and reveal their specific contributions to cognition. The authors analyze two studies that manipulated reward anticipation intervals to correspond to putative phasic (<500 ms) or ramping (multi-second) DA windows. The first study (Chiew and Braver, 2016) used an Eriksen flanker task to assess cognitive control. Participants received task-informative cues and reward incentives either 2000 ms (Early Incentive) or 300 ms (Late Incentive) before the target. The second study (Stanek et al., submitted) examined incidental episodic encoding. Participants viewed objects during reward anticipation periods defined as Early Epoch (immediately after cue onset) or Late Epoch (just before reward outcome), under conditions of 0%, 50%, or 100% reward probability. Memory was tested immediately and after 24 hours. The results demonstrated that prolonged reward anticipation (associated with ramping DA) enhanced both cognitive control and memory, but only in interaction with specific contextual factors. In the control task, the Early Incentive condition (2000 ms anticipation) significantly reduced interference costs, but only when combined with task-informative cues. In contrast, the Late Incentive condition (300 ms) led to response speeding without improved control. In the memory task, objects presented during the Late Epoch (prolonged anticipation) showed enhanced memory specifically under reward uncertainty (50% probability), an effect present at both immediate and 24-hour retention intervals. Conversely, objects presented during the Early Epoch showed memory benefits that scaled linearly with expected reward value (100% > 50% > 0%) but only after 24-hour consolidation, consistent with phasic DA dynamics. The authors conclude that task-informative cues and reward uncertainty may both serve as "need-for-control" signals that facilitate learning through enhanced environmental monitoring, supported by ramping DA activity. This suggests a synergistic role for DA across cognitive domains, where prolonged anticipation primes the system for control and selective encoding. The paper highlights that while phasic DA effects align with prior literature on value-based learning and consolidation, the distinct contributions of ramping DA require further characterization. Future research is recommended to test whether uncertainty and control signals similarly enhance memory for task-relevant stimuli and to directly measure human ramping DA responses to clarify their cross-domain functional roles.

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• executive function