James knew that he was a participant in a study investigating the effectiveness of a new type of therapy for generalized anxiety disorder. He reported a reduction in the frequency of his generalized anxiety disorder after he started meeting with a therapist once a week. However, James had not received the new therapy; the therapist just chatted with James each week. James' expectation of improvement reduced the symptoms of generalized anxiety disorder which is an example of a(n):
a. significant difference
b. placebo effect
c. experimental effect
d. double-blind difference
b. placebo effect
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