Theory of Mind (ToM) is the fundamental human ability to understand that others have mental states—such as beliefs, desires, intentions, and emotions—that differ from one's own and that these states influence their behavior. The ability to understand others' thoughts and emotions is essential for social cognition. It lays the foundation for effective communication, empathy, predicting behaviors, and managing complex social interactions. ToM empowers individuals to interpret and anticipate what others might be thinking or feeling, enabling them to navigate social situations with greater insight and ease.

In hypnotherapy, the "Kappasinian Theory of Mind" is a model that describes the mind as having distinct "components" or "areas": the Primitive Area (instincts), the Modern Memory (experiences), the Conscious Area (logic), and the Critical Area (filters). Hypnotherapy works by temporarily overwhelming the Critical Area to bypass it, allowing positive suggestions to directly access and influence the Subconscious (Modern Memory and Primitive Area) for healing and goal achievement, such as weight loss or smoking cessation.