Autism - triradii and head/life line features

**zaobhand** on Sun Oct 24, 2010 5:29 am

Hi Martijn

It was very interesting to read about the various dermatoglyphics observed at pinky finger (communication) for autism.

Could you please clarify a bit what you mean by the following observation:
FEATURE 2: both hands show at least 28 triradii + in both hands is the proximal transversal crease (the so-called 'head line') connected to the longitudinal crease (the so-called 'life line')

Thanks
Boaz

**Martijn (admin)** on Mon Oct 25, 2010 11:23 am

Hi Boaz,

Thank you for your question! I will try to explain the meaning of:

"FEATURE 2: both hands show at least 28 triradii + in both hands is the proximal transversal crease (the so-called 'head line') connected to the longitudinal crease (the so-called 'life line')"

NOTICE: For those who are not aware of this research, Boaz found it here (in the statistics of the 'appendix'):
http://www.handresearch.com/hand/Evolutie/autismeEngels.htm

Basically, what I have found in my autism research is that quite a few of these people have a rather exceptionally high number of 'triradii' on the palms and fingers.

The average hand has about 20 triradii (for each hand: 5 in the palm + 5 on the fingers); though I must add that many people who have 'whorls' on the fingertips have a few more triradii (depending on the number of whorls + the palmar variations).

NOTICE: Every fingerprint 'whorl' is featured with 2 triradii; every fingerprint 'loop' is featured with 1 triradius, and in a fingerprint 'arch' you will find no triradius at all.

Usually not many people have 28 triradii or more (this requires for example to have at least 8 fingerprint whorls combined with no missing triradius in the palm, etc.).

Boaz, have I answered your question?

Autism - triradii and head/life line features 8triradii

Autism - triradii and head/life line features 8triradii

**zaobhand** on Mon Oct 25, 2010 1:45 pm

Hi Martijn,

Thank you for your detailed reply. Yes, definitely you have answered my question. Very interesting! I would assume that many whorls would also further accentuate isolation on a predisposed hand (with dermatoglyphics about the pinky finger). Connected head and life lines also suggest further inhibition (other factors excluded). Makes sense.

Boaz

**Martijn (admin)** on Mon Oct 25, 2010 2:02 pm

Thanks Boaz,

The basic idea behind these results is... that in order to understand how autism manifests via the hand, it is important to consider in both hands the combination of: palms + fingers!

(Counting the triradii in both hands is a clear example of this combination!)

wave

**Martijn (admin)** on Thu Feb 26, 2015 11:54 am

A 2014 Dutch study has reported a very high frequency (in more than half of the 4 fingers, thumb excluded) of fingerprint pattern asymmetry (based on an arch - loop - whorl division):
Mild Dermatoglyphic Deviations in Adolescents with Autism Spectrum Disorders and Average Intellectual Abilities as Compared to Typically Developing Boys

(Prevalence: ASD 2.2, controls 1.8)

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Autism - triradii and head/life line features

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