Final answer:
Daniel Levinson suggested that adults go through transformations, focusing on the various stages and transitions in adult development. Erik Erikson extended developmental stages across the lifespan, but it was Levinson who specifically concentrated on adult transformations.
Step-by-step explanation:
The psychologist who suggested that adults go through transformations is Daniel Levinson. Levinson is known for his theory on adult development, which is categorized into various stages and transitions that occur throughout the adult life cycle. This contrasts with the theories of Freud, Erikson, and Bandura, who focused respectively on psychosexual development, psychosocial development, and observational learning.
Erik Erikson developed a theory that complements Freud's by extending the stages of development across the lifespan, emphasizing social interactions and their effects on personality development. Although Erikson's theory recognizes changes that occur in adulthood, Levinson's work specifically concentrates on adult developmental stages which are characterized by periods of stability and periods of transition, proposing that adults undergo significant transformations as they age.
Albert Bandura, on the other hand, proposed observational learning, highlighting the role of modeling and social learning in individual development but did not specifically focus on adult transformations in his theory.