This chapter provides in-depth mechanisms of action for the claims made in the previous chapter from a clinical psychology perspective, especially for functions associated with the left hemisphere. Language and functions associated with the left hemisphere are argued to be some of the key factors that form conventional reality (reality as it is subjectively experienced by one’s own psychological functions). Relational Frame Theory, process-based psychotherapy approaches, and the psychological flexibility/inflexibility models are discussed as current models in mental health/psychotherapy. These models are also discussed with respect to the psychology of awakeningAwakening and are argued to be inadequate to fully account for awakening, as the narrow focus on language is not sufficient to include other key psychological processes, which is a discussion that is continued in Chap. 6 .