Consciousness, Identity, and Purpose Under Thermodynamic Constraint: The Coherent Arc Model

Living systems maintain themselves against dissolution under irreversible thermodynamic constraint. As some of these systems develop increasing internal coherence, they become more complex, and their coordination demands increase. In sufficiently complex systems, coordination is globally integrated, self-relevant, and valenced. This paper argues that consciousness is this coordination. Consciousness makes felt evaluation possible. Felt evaluation anchors abstract constructs within the regulatory architecture, producing identity: a temporally extended self-model that the system inhabits and regulates across time. Purpose is the regulation of that identity toward coherent completion within constraint. The model specifies three structural layers of continuity: biological maintenance, experiential regulation, and identity-level regulation. It traces the expansion of the temporal horizon across development, identifies characteristic failures of calibration in both clinical and ordinary contexts, and explains why, under certain conditions, identity coherence can take priority over biological survival. The identity claim about consciousness generates a further class of empirical prediction testable through artificial systems whose coordination architectures can be constructed and decomposed with full transparency.