Related Constructs and Theoretical Differentiation: Situating Epiphanesthesia in Existing Research

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. The paper does not claim to have established this account empirically. Its contribution is to circumscribe the phenomenon with sufficient precision, three criteria generating determinate verdicts on boundary cases, a candidate neurobiological substrate, and four predictions capable of discriminating the structural-convergence hypothesis from its closest alternatives, that the construct becomes a candidate for future empirical investigation rather than remaining an unnamed overlap between existing categories.