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Hair Whorl-A Genetically Bound Phenomenon in Testing of Right-handedness and Hemispheric Dominance


Authors: J. Tichý
Authors‘ workplace: Neurologická klinika 1. LF UK a VFN, Praha
Published in: Čas. Lék. čes. 2006; 145: 955-958
Category: Original Article

Overview

Background.
The importance of normal development of hemispheric dominance and its significance for the development of an individual is sufficiently known. The internationally not well known procedure according to Zlab (1) represents one of the most suitable examinations for right-handedness and laterality testing. 

Methods and Results.
In our study we used one of the most popular questionnaires for phenotype testing of handedness- Edinburgh’s Inventory (2). According to this questionnaire we have examined 65 children 10 years of age (± one year), and classified them into 3 groups: a) pure right-handed (n=51), b) pure left-handed (n=5) (all have fulfilled +90–100% resp. –90–100% of answers on corresponding ten questions) and c) a group of mixed laterality- -ambidextrous (n=9). The questionnaire we have accomplished by means of objective testing of hair whorl direction presupposed clockwise in right-handed and counter clockwise in lefthanded. Some of other tests we used turn to be more reliable than lid opening and using a broom (upper hand) by „dominant“ hand used in Edinburg’s Handedness Inventory. We have examined also hand, elbow, knee and leg joints excursibiliy (enlarged passivity and/or diminished muscle tonus) to define cerebellar dominance: right cerebellar hemisphere in right-handed and left cerebellar hemisphere in left-handed. In the group of pure right-handers we found clockwise hair whorl in 23 of 25 boys. In girls (probably due tu various hair combing) we found clockwise hair whorl only in 12 of 26 children. 

Conclusions.
Examination of the hair whorl direction seems to be enrichment for a quick clinical phenotype and genotype laterality testing. 

Key words:
hair whorl, genotype, right-handedness, left-handedness, hemispheric dominance.


Labels
Addictology Allergology and clinical immunology Angiology Audiology Clinical biochemistry Dermatology & STDs Paediatric gastroenterology Paediatric surgery Paediatric cardiology Paediatric neurology Paediatric ENT Paediatric psychiatry Paediatric rheumatology Diabetology Pharmacy Vascular surgery Pain management Dental Hygienist

Article was published in

Journal of Czech Physicians

Issue 12

2006 Issue 12

Most read in this issue
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