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How can hypnosis affect eyewitness testimony?  

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How can hypnosis affect eyewitness testimony? Under hypnosis an eyewitness could produce false information whist giving a statement to the police. This is because one of the characteristic of being hypnotised is being sensitive to suggestion. Therefore the witness can give suggestive information through leading question (even if this isn't intended). It could lead to an alteration of the existing true memory. Although hypnosis might produce increased recall, it also produces more error; quantity doesn't always mean quality in this case. Through hypnosis it is easy for the interrogator to implant false information into the mind of the eyewitness. In this way again memory can be distorted. In the study by Hilgard (1965), you can clearly see how suggestions of negative visual hallucination and others can distort the participants' recall. Therefore the effect of hypnosis on eyewitness testimony is indeed a big effect and should be used with caution. Study: Yuille...

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