NCJ Number
111634
Journal
Polygraph Volume: 16 Issue: 2 Dated: (1987) Pages: 97-105
Date Published
1987
Length
9 pages
Annotation
This study compares the utility of the standard 'yes/no' response and the 'key word' response (Subject repeats a key word from the polygraph examiner's question in addition to the standard yes/no response) during the administration of polygraph screening examinations.
Abstract
A total of 120 subjects of official polygraph examinations were randomly assigned to one of two groups. Group 1 was tested using the relevant/irrelevant technique with the standard yes/no response by each subject. Group 2 was also tested using the relevant/irrelevant technique but with the key-word response by each subject. Each polygraph examination consisted of several series of charts with the particular technique. A series consisted of counterintelligence and suitability relevant questions. Three certified polygraph examiners conducted all of the examinations, using a Lafayette Ambassador polygraph instrument, which monitored relative change in thoracic and abdominal respiratory patterns, electrodermal activity, and cardiovascular activity. Results indicate that the standard yes/no response and the key word response produce similar numbers of 'no significant reactions,' 'significant physiological reactions,' and 'inconclusive reactions.' The two techniques are thus similarly successful in developing information. The average number of charts necessary to reach a determination were nearly identical. The overall time of administration was not significantly different between the two techniques. At the minimum, the key word response should be considered as an alternative in approaching re-examinations when the examiner suspects the subject to be unstimulated or having difficulty focusing on what is relevant. 3 tables and 2 references.