Describing the dynamical nature of happiness is crucial for understanding why individuals are constantly running on a hedonic treadmill around set levels of well-being. Based on the self-centeredness branch of the ’self-centeredness/selflessness happiness model’, we present a dynamical model that focuses on unfolding the hedonic dimension of happiness dynamics through the use of the approach–avoidance framework. This numerical model enables us to understand and analyze emerging hedonic cycles caused by hedonic motivation and hedonic adaptation. In particular, hedonic motivation leads people to experience hedonic activities, which result in successes or failures and experiences of pleasure and afflictive affects; whereas hedonic adaptation causes individuals to return to a baseline level of pleasure and afflictive affects, more quickly for the former than the latter. The proposed dynamical model is based on the approach–avoidance framework that considers human behavior in two separate regulatory processes that contribute to homeostasis of individuals’ happiness. We analyze these two processes independently and conjointly in order to highlight their effect on happiness levels. The analysis shows how individual characteristics and their combination may result in hedonic cycles, afflictive affects, (dis-)pleasure, and particular happiness dynamics. We also discuss how such a numerical model enables us to perform a multifactorial analysis which is hardly feasible outside the context of a simulation and how it may help us to narrow and design relevant experimental surveys from these preliminary numerical results.

描述幸福的动态本质对于理解为什么个人不断在享乐跑步机上围绕设定的幸福水平跑步至关重要。基于“自我中心/无私幸福模型”的自我中心分支，我们提出了一个动态模型，重点是通过使用接近-回避框架来展现幸福动态的享乐维度。这个数值模型使我们能够理解和分析由享乐动机和享乐适应引起的新兴享乐循环。特别是，享乐动机引导人们体验享乐活动，从而导致成功或失败以及快乐和痛苦的体验；而享乐适应使个体恢复到快乐和痛苦影响的基线水平，前者比后者更快。所提出的动态模型基于接近-回避框架，该框架考虑了两个独立的调节过程中的人类行为，这有助于个人幸福的稳态。我们独立和联合分析这两个过程，以强调它们对幸福水平的影响。分析显示了个体特征及其组合如何导致享乐循环、痛苦影响、（不）愉悦和特定的幸福动态。我们还讨论了这样的数值模型如何使我们能够进行多因素分析，这在模拟环境之外几乎是不可行的，以及它如何帮助我们根据这些初步数值结果缩小范围并设计相关的实验调查。