The Use of Psychological Techniques in Tests of Deception

TL;DRAbstract

A summary of the work of experienced examiners in deception indicates that errors in the interpretation of their graphs do not exceed 3 per cent.However, an additional 17 per cent of their graphs are too indefinite for them to make a finding of deception.'This means that one out of five suspects is an emotional or mental deviate who cannot be successfully tested with the methods in common use. 2 Apparently some new techniques are needed which will give valid results in these cases.The psychological techniques outlined in this paper have been found useful in testing deviates whose reactions are difficult to interpret.The first technique used is the determination of the psychological type of the suspect, that is, whether he is a normal reactor or a deviate.Typing the suspect answers the question: Would this suspect, if given the opportunity, be likely to commit a crime of this kind?Four types of deviates may be identified from tests made with the Reactograph, 3 an extremely sensitive rec

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