Eliciting Information From Groups: Social Information and the Concealed Information Test

Polygraph recordings of physiological reactions to a Group Concealed Information Test identified exposure to one of three mock village scenarios. Sixty-nine participants worked in groups on a card construction project while viewing tea making, bomb making, or no event. Participants denied knowledge of the events, but skin resistance and heart rate scores analysed by means of a multivariate analysis of variance, F(8, 106) = 4.08, and analyses of variance showed the tea group responding most on tea-related questions on skin resistance, F(2, 56) = 1 1.57, and heart rate, F(2, 56) = 4.58. The bomb group was highest for skin resistance, F(2, 56) = 6.17. Four of five and three of four groups …