Final answer:
Psychotherapy is the technique used to facilitate positive changes in individuals' personality, behavior, or adjustment. Hypnosis is especially effective for those open to suggestion and can alter cognitive processes like learning.
Step-by-step explanation:
The psychological technique used to facilitate positive changes in a person's personality, behavior, or adjustment is psychotherapy. It aims to assist individuals in overcoming difficulties or achieving personal growth by involving cognitive-behavioral strategies among others. It's essential to note that hypnosis is most effective in individuals particularly open to the power of suggestion. Hypnosis is a focus on the self and can be a potent tool for change in such individuals as it involves minimal attention to external stimuli and maximizes responsiveness to suggestion. Furthermore, research suggests that cognitive processes, like learning, can be impacted by various methods including hypnosis and meditation, but it is psychotherapy that encompasses a broad range of treatments for psychological disorders.