Multi-Scale Temporal Resonance Theory of Consciousness (MSTRT): From Molecular Mechanisms to Minimal Functional Specifications, Necessary and Sufficient Conditions, and the Role of Sensory Input, Memory, and Motivational Drive

What are the necessary and sufficient conditions for consciousness to arise in a physical system? This paper presents the Multi-Scale Temporal Resonance Theory (MSTRT), a framework arguing that consciousness emerges from temporally structured resonance across multiple spatial and temporal scales — from ion channel dynamics to whole-brain network topology. MSTRT builds directly upon and substantially extends the Dendritic Integration Theory (DIT; Aru, Suzuki, & Larkum, 2020) and the apical amplification (AA) framework (Phillips, Bachmann, & Storm, 2018). Its principal novel contributions are threefold. First, it provides an explicit mechanistic account of how the BAC firing cycle in Layer 5 pyramidal neurons intrinsically generates θ-γ phase-amplitude coupling, grounding a widely observed network-level oscillatory signature in single-cell biophysics. Second, it introduces a computable composite index — CSDI₂.₀, composed of structural (FRP), dynamic (EDRR), and structure-dynamics alignment (Match₂.₀) components — designed to quantify a system's capacity for conscious processing. Third, it proposes six substrate-independent minimal functional specifications (MFS-1–6) and a concrete three-layer minimal conscious system architecture, offering a pathway toward computational simulation and empirical falsification. The paper also provides a systematic necessity analysis of content domains (sensory input, memory, motivation), concluding that only ultra-short temporal buffering (~200–250 ms) may be strictly necessary for minimal consciousness. MSTRT adopts a "process structuralist" philosophical position, arguing that consciousness requires neither structure alone nor function alone, but the right dynamic process-structure. The framework is positioned as falsifiable, quantitative, and open to cross-disciplinary scrutiny. Keywords: consciousness, temporal resonance, phase-amplitude coupling, BAC firing, apical amplification, dendritic integration, theta-gamma coupling, Layer 5 pyramidal neurons, minimal conscious system, CSDI, substrate independence