"Mental Reservoir Theory: A Multidimensional Model of the Human Psyche" introduces a unified psychological framework that integrates emotional, cognitive, sensory-embodied, and subconscious processes. Drawing upon interdisciplinary research from neuroscience, cognitive psychology, and affective science, the book explores how accumulated internal residues shape perception, decision-making, and behavior. Through theoretical exposition, empirical validation, and applied intervention models, it offers a comprehensive lens for understanding human adaptation and psychological transformation.