Anton Mesmer, an early 18th-century physician, purported to cure patients by unblocking the flow of a bodily fluid he called "animal magnetism." Benjamin Franklin's double-blind experiment indicated that any effectiveness of Mesmer's methods was actually because of which of the following?

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Benjamin Franklin's double-blind experiment showed that Mesmer's methods were ineffective and that any perceived improvement in patients was due to the power of suggestion, also known as the placebo effect.

Anton Mesmer, an Early 18th-Century Physician, Purported to Cure Patients