Final answer:
Psychology encompasses various subfields that relate to the intrapersonal level, including cognitive psychology, developmental psychology, and social psychology, each exploring the complexities of individual thought, development, and social interactions.
Step-by-step explanation:
The field of psychology covers numerous areas of study related to the intrapersonal level, which pertains to the individual.
Within this realm, cognitive psychology focuses on the study of thought processes and their relation to behavior, developmental psychology explores the changes that occur throughout a lifespan—both physically and cognitively, while social psychology examines how individuals interact with others and are influenced by social environments. Intriguingly, each of these subfields overlaps with intrapersonal phenomena such as emotions, attitudes, self-concept, and social cognition, underscoring the interconnectedness of human thinking, feeling, and social interactions.