The effects of beliefs and information about hypnosis on the legal defence of automatism through hypnosis

Abstract

The aims of this study were to assess the impact of public conceptions about the nature and coercive powers of hypnosis, and information regarding different approaches to hypnosis, on the plea of automatism through hypnosis in a criminal trial. Subjects were assigned to three groups. Two were presented with criminal cases in which automatism through hypnosis was implicated, as well as duress; one of these groups received information about different approaches to hypnosis. The third received the same cases, but with duress alone. Results showed that, when automatism through hypnosis was implicated as well as duress, the defendant offering the plea was judged less responsible, however, he was not judged less guilty than when duress alone was the defence. Also, subjects presented with the plea of automatism tended to be more sceptical about the idea than those not presented with this plea. The provision of information on different approaches to hypnosis was largely ineffective in altering beliefs and judgments. Judgments of guilt and responsibility were, however, strongly influenced by beliefs about automatism through hypnosis.