Unified Quantum Consciousness Postulation: Conditional Physical-Mechanism Extension — Microtubule Excitation Transport as a Candidate Modulatory Substrate

The Unified Quantum Consciousness Postulation (UQCP) proposes that consciousness is accessed through a physical interface rather than generated solely by biological tissue. This manuscript is a conditional physical-mechanism extension and methodological refinement of the previously published UQCP framework. It replaces earlier broad microtubule “tuning” language with experimentally defined excitation-transport variables and explicit dependency gates.The framework separates three evidential levels: physical microtubule excitation transport, biological relevance to conscious-state processes, and UQCP-specific non-local predictions. A positive result at one level does not establish the next. The manuscript also defines Bridge U1–U5 falsification criteria and a cross-paper mapping to the independent Transport Physics v2 experimental program.This document does not treat microtubule transport, electrical oscillations, anesthesia sensitivity, or engineered array behavior as evidence for an external consciousness field.