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Footnote References

Common Dermatoglyphic Variables:

(1) A-B Ridge Count

Number of fingerprint lines between the A triradius point and the B triradius point

39.3 is the mean

Other ridge counts, for instance the B - C, C - D, A -D ridge count, and the combination of left and right hands are also used

(2)  Pattern Intensity

The total number of triradii on all ten fingers

A triradius is a point where the pattern deviates into three directions

Arches have no triradii, Loops have one, Whorls have two

12.1 is the mean

Arch Loop Whorl                                   
(3) ATD Angle
Angle made by connecting the A, T, and D triradii points

The lower T point is always used if there are more than one

~50 degrees is the mean

The ATD changes as a person ages

(4)  Palmar Crease Line Comparisons

(5)  Statistical Comparison of Pattern Types:  How many subjects have Whorl formations on the thumb compared to the general population? Etc.

(6)  Main Line Index

Mathematical formula showing degree of transversality

Track lines from the A triradii point (the A Line) to a location on outer edge of palm and add to number derived from D line terminus.

A Line terminates at 3

D Line terminates at + 6

Main Line Index = 9

(7)  Statistical Comparisons of the Thenar, Hypothenar; Areas II, III, IV

Does Area II have a Loop or Whorl?  Etc.

The Hypothenar Eminence has Whorls in only 6 cases per thousand, Thenar Whorls are even less common.

Certain formations occur with greater frequency in particular cases, for instance, the Composite Whorl (a subset of the Whorl) (a subset of the Whorl) shows up in 18% of schizophrenic hands. (26)

(8) Presence or Absence of the Sydney or Simian Lines

Sydney Line: Head line goes completely across palm

Normal arrangement:  Heart, head, life lines

Simian Crease:  Heart and head joined

 



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