Related Constructs and Theoretical Differentiation: Situating Epiphanesthesia in Existing Research

Abstract

This paper introduces epiphanesthesia as a candidate third functional category of interoceptive content, distinct from physiological homeostatic signals and from emotional substrates. Epiphanesthesia is defined by three necessary criteria: the signal indexes structural convergence between previously unintegrated representations rather than affective valence or homeostatic state; it precedes the declarative representation of the convergence it registers; it arises spontaneously, without deliberate attention directed to the interoceptive channel. The paper maps this construct against five research traditions that partially converge on the same phenomenal territory: the aha-experience literature, Damasio’s somatic marker hypothesis, Gendlin’s felt sense, the frisson literature, and embodied cognition. Each tradition documents phenomena that approach the class epiphanesthesia proposes to name while stopping short of it along a specific discriminating dimension. The frisson is proposed as a candidate high-intensity limiting case of epiphanesthesia rather than as a music-specific emotional response, with its emotional quality positioned as downstream of the structural indexing event rather than constitutive of it. A neurobiological hypothesis implicates the anterior insula as the candidate substrate of the signal, receiving input from prefrontal and temporal association areas at the moment of representational convergence and generating a prediction-error response consistent with the Free Energy Principle. Four testable predictions are derived, centred on a predicted dissociation between epiphanesthesic and affective-interoceptive signals in individuals scoring high on alexithymia measures. This dissociation, if confirmed, would supply the first empirical evidence for functionally separable interoceptive channels and reframe a subset of alexithymia presentations as selective deficits in affective, not structural-convergence, interoception.