This chapter examines key mental entities, such as the mind (psyche), consciousness, the “I,” thinking, will, attention, awareness, understanding, and intelligence, emphasizing their representational nature. In contrast to the objectivist tradition, the author argues that these entities are not revealed through introspection in the mind as some kind of ontological given that merely needs to be described. Rather, they are formed by researchers through reflection, imagination, and intersubjective discussion in the scientific and cultural community. Once collectively acknowledged, these newly verbalized entities become embedded in language, becoming part of mental reality and an important component of objective mental reality. The author notes that the psyche (mind) and consciousness are not transcendent in relation to the body, but function in an inseparable connection with it, ceasing to be able to manifest themselves once the underlying physical structure ceases to exist. The author offers an original interpretation of such entities as the psyche (mind) and consciousness. The “I” is examined as a sensory-verbal representation of an active organism, associated with the sense of personal existence. The author highlights the conceptual indeterminacy of psychological categories and proposes viewing them as complex mental constructions—the products of cognitive and linguistic activity that serve a heuristic and explanatory function in the science of the mind.