从“是”到“应当”的身体通道——“反映—反应”模型与规范性的发生学解释

中文摘要

休谟关于“是”与“应当”的观察首先是一个逻辑警告：纯粹事实前提不能凭自身保证规范性结论。本文不试图取消这一命题鸿沟，而是区分“规范命题的逻辑正当化”与“规范体验的实际发生”，追问一个被前者遮蔽的问题：事实何以在生命过程中获得行动指向，并被主体体验为“应当”。为此，本文提出“反映—反应”的功能模型：所谓“反映”，指对情境的事实表征；所谓“反应”，指事实进入主体的利害与行动结构后所引发的情感、内感受和行动倾向。吉布森的可供性理论说明环境为何以“可做什么”的关系方式出现，达马西奥的躯体标记假说与内感受研究则提供事实获得行动权重的一种经验性解释。本文将这一前命题性的行动驱动界定为“应然感”，并以“体感沉淀”描述其在习惯、教育和社会实践中的内化。由此形成“身体奠基—理性校正—第二自然定型”的三层结构：身体解释规范性何以具有驱动力，理性负责理由比较与可辩护性，社会实践则把个体反应塑造成可共享的规范能力。本文因此提供的不是从“是”到“应当”的逻辑推导，而是一条从事实相关性到应然体验、再到规范判断的发生学通道

Abstract

Hume's observation about "is" and "ought" is, first of all, a logical warning: purely factual premises cannot, by themselves, guarantee normative conclusions. This paper does not attempt to cancel this propositional gap, but distinguishes "the logical justification of normative propositions" from "the actual occurrence of normative experience," asking a question obscured by the former: how do facts acquire action-directedness in living processes and come to be experienced by subjects as "ought"? To this end, the paper proposes a functional model of "reflection and response": "reflection" refers to the factual representation of a situation; "response" refers to the emotions, interoceptive states, and action tendencies elicited when facts enter the subject's structure of interest and action. Gibson's affordance theory explains why the environment appears in the relational mode of "what can be done," while Damasio's somatic marker hypothesis and interoception research provide an empirical explanation of how facts acquire action weight. The paper defines this pre-propositional action drive as "the sense of ought," and uses "somatic sedimentation" to describe its internalization in habit, education, and social practice. This yields a three-layer structure of "bodily grounding, rational correction, and second-nature stabilization": the body explains why normativity has driving force, reason is responsible for the comparison of reasons and justifiability, and social practice shapes individual responses into shared normative capacities. The paper therefore provides not a logical derivation from "is" to "ought," but a genetic pathway from factual relevance to ought-experience and then to normative judgment.

关键词：休谟问题；是—应当；反映—反应；躯体标记；可供性；内感受；第二自

Keywords: Hume's problem; is-ought; reflection-response; somatic marker; affordance; interoception; second nature