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

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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 rpbs 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

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