Necker cube reversals, arousal and psychopathy.

Necker cube reversals were studied in a group of 24 arrested men in three experimental sessions; two weeks, one week and immediately before trial. The first session was assumed to represent a moderate laboratory stress due to the novelty of the situation, and the last session a real-life stress associated with anticipation of appearing in court. Both were superimposed on the sustained real-life stress of being in jail. There were no stress-related changes between the three sessions in the rate of apparent change (RAC) of the Necker cube. The intra-individual stability of RAC was extremely high. There were significant positive correlations between RAC in all sessions, and a psychopathy-related inventory scale, the Gough delinquency scale.