Abstract
Temporal respiratory change responses were investigated in 113 concealed information tests (CITs) conducted in the field. The guilty knowledge of all CIT examinees was confirmed in subsequent investigations. Respiratory amplitude (RA), respiratory rate (RR), and respiratory speed per cycle (RScyc) were measured each second for 25 seconds following stimulus onset. The results indicated that RA, RR, and RScyc decreased significantly for the critical item, in comparison to the non-critical item in the period between 1 and 18 s, 9 and 25 s, and 2 and 25 s after stimulus onset. Result of the detection rate indicated even more remarkable differences in temporal characteristics between RA and RR. Moreover, detection rate in RScyc was superior to those of RA and RR.
