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Who was the first psychologist to study the effects of hypnosis?
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That would be James Braid, who was a Scottish physician. He was the first to describe the phenomenon of hypnotic trance and to use it to treat patients. He published his first paper on hypnosis in 1843, and his second paper in 1844. He was the first to describe the phenomenon of hypnotic trance and to use it to treat patients.