A new hypothesis called Quantum-like Qualia (QQ) proposes that qualia—the qualities of conscious experience—are best described by the mathematical structure of quantum theory, rather than as points in a dimensional space. The standard view assumes qualia can be measured without changing them, but empirical findings show that internal attention can alter qualia during measurement. QQ treats qualia as observables, sensory inputs and internal attention as states, and measurement outcomes as probabilistic. This structure predicts that qualia can be indeterminate, which can be tested through order effects or violations of Bell inequalities. Confirmation would suggest that quantum mathematics offers novel insights into consciousness.
Human consciousness constantly shifts through time, yet each moment is experienced as "now." This duality, called "the standing-streaming now" in Husserlian phenomenology, can be precisely formalized using category theory: the structure of the "now" corresponds to a monoid, while viewing present moments as discrete points on a timeline corresponds to a coslice category. This mathematical framework clarifies differences between ordinary consciousness and meditative states, such as the "eternal now" described in early Buddhist scriptures (Pali Canon) and Dōgen's Shōbōgenzō, which remarkably reflect a monoid structure.