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Effects of hand preference on digit lengths and digit ratios among children and adults
Sanjay Kumar1, Maharaj Singh2, Martin Voracek3
1Department of Psychology, D.A.V. College, Muzaffarnagar, Uttar Pradesh, India.
Background:
Prenatal sex hormones may not exclusively determine effects of hand preference on digit ratios. Genetic determination is an alternative possibility.
Aim:
To study the likelihood of similar effects of hand preference on digit lengths and digit ratios.
Methods:
We selected similar numbers of left-handers and right-handers in samples of kindergarten children (N = 101, age range: 3.5-7 years) and adults (N = 189, age range: 17-28 years) and measured digit lengths (excluding the thumb) directly on the palmar hand.
Results:
Compared to right-handers, left-handers had longer digits and lower third-to-fourth (3D:4D) digit ratios among children, whereas an opposite pattern of handedness differences occurred among adults.
Conclusions:
Effects of hand preference on digit lengths and ratios might be genetically/ontogenetically determined. Also discussed are implications of this set of findings for digit ratio research.
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