Mind as a Historically Shaped Transition Field: Subjective Time, Action Readiness, and the Measurement of Mental Dynamics

Mind is often approached either as an inner domain to be localized or as a set of cognitive operations to be modeled. The Natural Criticality Hypothesis (CLaE, 2026a) suggests a different starting point: mind is a historically shaped transition field, continuously coupled to bodily, environmental, mnemonic, and relational conditions. Cognition is not a sequence of computations occurring inside a sealed interior, but a continuous trajectory on a metastable dynamical manifold whose topology is shaped by the organism’s history. This paper makes explicit the ontological and measurement implications of this view. Subjective time is defined as τ(t) = 1/r(t), where r(t) denotes action-readiness density. Here, r(t) is interpreted as a transition-density variable: an index of how reachable adaptive state transitions are from the system’s current configuration. Subjective time is therefore not an isolated phenomenological report, but a dynamical signature of transition accessibility. When transition becomes remote or locally blocked, subjective time dilates; when coordinated transition becomes accessible, subjective time compresses. This interpretation clarifies both the value and the limits of neuroimaging. Brain imaging is indispensable for identifying neural correlates and modeling network dynamics, but it is insufficient as a standalone proof of r(t). The reason is not technical weakness alone, but a category mismatch: r(t) is not a localized neural signal. It is a coupled variable emerging from brain, body, memory, environment, and relational regulation. Longitudinal autonomic and bodily dynamics — including heart-rate variability, respiration, sleep structure, electrodermal activity, temperature, activity patterns, and behavioral transition — may therefore provide a more faithful empirical window into the transition field than isolated neural snapshots. On this basis, impaired action can be reinterpreted as attractor capture within a historically shaped field rather than weakness of an enclosed mind. Intervention correspondingly modifies gradients, boundary conditions, and reachable trajectories rather than repairing a sealed interior. The paper argues that a scientific theory of mind should begin not with the search for a hidden container, but with the measurable coupled dynamics by which a living system remains capable of transition.