Consciousness and Its Explanatory Gap: A Review of the Mind-Body Problem from Qualia and Zombies to the Extended Mind

Abstract

The problem of consciousness occupies a singular position in contemporary philosophy: universally acknowledged as difficult, unresolved in its central question, and productive of a technical literature whose positions are now sharply defined. This review synthesizes the development of the mind-body problem from the mid-twentieth-century critiques of empiricism to the present landscape of physicalist, functionalist, and anti-physicalist positions. We reconstruct the argumentative skeleton of the debate: Nagel's formulation of phenomenal subjectivity, Jackson's knowledge argument, Chalmers's distinction between easy and hard problems and the zombie conceivability argument, the functionalist and representationalist responses culminating in Dennett's heterophenomenology, and the externalist reorientation of the extended mind thesis. The synthesis proceeds by the dialectical structure of the literature rather than by chronology, showing how each canonical argument fixes a constraint that subsequent positions must either satisfy or explicitly reject. Particular attention is paid to the methodological role of conceivability and possibility claims, which carry the metaphysical weight of the debate, and to the empirical turn, in which cognitive science has both disciplined and been disciplined by the philosophy. Open problems include the epistemology of phenomenal concepts, the status of thought experiments under physicalism, and the integration of the extended cognition program with the theory of phenomenal consciousness. The review concludes that the problem's persistence reflects not conceptual stagnation but a genuine structural tension between the first-person character of experience and the third-person character of scientific explanation.