Reward Dysfunction in Time: Toward a Dynamic Psychiatry of Motivation and Pleasure

You are an avid football fan, and the World Cup is in full swing.Your team is playing tonight in a must-win game; in anticipation of the big game, you feel excitement, and you vividly remember the joy you felt 4 years ago when your team advanced to the semifinals.Despite all odds, your team wins again, and the pleasure you experience is even stronger than what you were expecting.For many, these types of feelings fuel them through their lives.However, for individuals with anhedonia, such experiences and processes are disrupted.What used to give them joy and motivation elicits little pleasure.This is consequential because anhedonia has been linked to poor prognosis, treatment response, and reduced psychosocial functioning across neuropsychiatric disorders.Classically, anhedonia has been conceptualized as a loss of pleasure.However, decades of work across species and fields have revised this conceptualization.Such work has emphasized that anhedonia itself is heterogeneous and can (and should) be decomposed into subdomains that are psychologically and neurobiologically distinct (1-3).Critically, this information could have actionable treatment implications.In a recent article published in Biological Psychiatry: Global Open Science, Zou et al. (4) offer an ambitious and timely review that reframes reward dysfunction as a temporally organized process rather than a single deficit in the reward system.The central tenet is simple but important: rewardrelated behavior is parsed into memory-derived value, cuetriggered incentive salience, anticipated pleasure, effort valuation, hedonic impact, outcome evaluation, value updating, and goal-directed versus habitual control (Figure 1).The same surface symptom (e.g., anhedonia, amotivation) can arise from different latent mechanisms.In this respect, the article provides a useful corrective to broad statement that patients with depression, schizophrenia, bipolar disorder, or substance use disorder have blunted reward.It also extends prior work emphasizing that anhedonia is not only a loss of pleasure but may involve impaired wanting, learning, valuation, and effort allocation (1-3,5).One of the article's strengths is its conceptual discipline.The authors distinguish anticipatory pleasure from incentive salience, hedonic impact from outcome evaluation, and reward valuation from effort valuation (4).Anticipatory pleasure reflects future enjoyment; incentive salience captures motivational pull, which may be cue triggered and partially dissociable from explicit expectation.Hedonic impact is immediate pleasure, whereas outcome evaluation includes feedback monitoring, prediction error, and cognitive appraisal.