Which of these has NOT been suggested as a reason for the beneficial effects of guided imagery?

Question

Quizplus · Accepted Answer

Guided imagery is believed to promote a state of relaxed concentration, give patients a decreased sense of helplessness over stressful aspects of a disease, and may work through the placebo effect. However, guided imagery does not remove the patient's sense of personal control, as the patient is still actively participating in the visualization process guided by a therapist.

Which of These Has NOT Been Suggested as a Reason