The Finapres (Volume Clamp) Recording Method in Psychophysiological Detection of Deception Examinations: Table 1 (Forensic Science Communications, October 1999)

U.S. Department of Justice

Federal Bureau of Investigation

October 1999   Volume 1   Number 3

The Finapres (Volume Clamp) Recording Method in Psychophysiological Detection of Deception Examinations: Experimental Comparison With the
Cardiograph Method

Table 1:

Descriptive Statistics and Point-Biserial Correlations With Role

 

	Standardized Difference Scores
	Innocent		Guilty
Measure	Mean	SD	Mean	SD	rpb
Finapres Group
Skin Conductance Amplitude	.67*	.80	-.46*	.49	.66*
Respiration Excursion	.45*	.75	-.26*	.39	.52*
Finapres Amplitude	.49*	.92	-.31*	.50	.49*
Finapres Pulse Amplitude	.66*	1.17	-.37*	.67	.48*
Heart Period Amplitude	.34	.86	-.11	.63	.30
n	20		20
Cardiograph Group
Skin Conductance Amplitude	.34*	.70	-.49*	.71	.51*
Respiration Excursion	.08	.58	-.46*	.61	.42*
Cardiograph Amplitude	.44*	.52	-.30*	.63	.55*
Cardiograph Pulse Amplitude	.42*	.45	-.09	.59	.44*
Heart Period Amplitude	.30*	.59	-.27	.61	.43*
n	20		20
Finapres/Cardiograph Group
Skin Conductance Amplitude	.51*	1.01	-.44*	.48	.53*
Respiration Excursion	.51*	.69	-.33*	.52	.58*
Finapres Amplitude	.28	.84	-.32*	.61	.39*
Cardiograph Amplitude	.25	.94	-.22	.60	.29
Finapres Pulse Amplitude	.30	1.16	-.53*	.64	.41*
Cardiograph Pulse Amplitude	.26	1.07	-.30*	.54	.31*
Heart Period Amplitude	.35*	.56	-.38	.92	.44*
n	20		20

The r_pbs are Pearson product moment correlations of the measures with Role. The difference score means were compared with 0.00 using two-tailed t tests. The value of 0.00 represents a difference of 0.00 between the mean relevant and control-question responses. Significant negative means indicate that the relevant-question responses were larger than the control-question responses; significant positive means indicate the reverse. SD = standard deviation.

* p < .05.

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FORENSIC SCIENCE COMMUNICATIONS    OCTOBER 1999   VOLUME 1    NUMBER 3