Final answer:
A cognitive theorist does focus on how thoughts, perceptions, and feelings shape personalities, aligning with the discipline of cognitive psychology which involves the study of mental processes and their impact on behavior.
Step-by-step explanation:
The statement that a psychologist who focuses on how thoughts, perceptions, and feelings shape personalities is a cognitive theorist is true. Cognitive psychology is the field of psychology that examines how people think, and its practitioners investigate the relationships among human thinking, emotion, and behavior. Therefore, cognitive theorists are indeed concerned with how thoughts, perceptions, and feelings contribute to the development and makeup of personalities.
Cognitive theorists believe that cognition is vital to understanding behavior, as indicated by the cognitive revolution in psychology, which highlighted the importance of mental processes. Moreover, personal goals, self-regulation, self-efficacy, and locus of control are among the cognitive factors that theorists like Albert Bandura and Julian Rotter have identified as influential in the development of personality. The field of cognitive psychology encompasses a broad range of topics, all aiming to understand the underlying cognitive processes that shape how individuals perceive, understand, and interact with the world.