Anhedonia is a reduction in enjoyment, motivation, or interest. It is common across mental health disorders and a harbinger of poor treatment outcomes. The enjoyment aspect, termed ‘consummatory anhedonia’, in particular poses fundamental questions about how the brain constructs rewards: what processes determine how intensely a reward is experienced? Here, we outline limitations of existing computational conceptualisations of consummatory anhedonia. We then suggest a richer reinforcement learning (RL) account of consummatory anhedonia with a reconceptualisation of subjective hedonic experience in terms of goal progress. This accounts qualitatively for the impact of stress, dysfunctional cognitions, and maladaptive beliefs on hedonic experience. The model also offers new views on the treatments for anhedonia.

中文翻译：

---

完美性快感缺失的计算结构

快感缺失是指享受、动力或兴趣的减少。它在精神健康障碍中很常见，也是治疗结果不佳的先兆。享受方面，被称为“完美的快感缺失”，特别提出了关于大脑如何构建奖励的基本问题：什么过程决定了奖励体验的强度？在这里，我们概述了现有的快感缺失计算概念的局限性。然后，我们建议对完成性快感缺乏进行更丰富的强化学习（RL）解释，并在目标进展方面重新概念化主观享乐体验。这从定性上解释了压力、功能失调的认知和适应不良的信念对享乐体验的影响。该模型还为快感缺乏的治疗提供了新的观点。