Internet study confirms: finger length is linked with handedness!

Handedness & your finger length ratio

While a few years ago early studies had identified a link between various hand characteristics and handness, last year the link was ‘officially’ confirmed in an Australian study that had used a new method for measuring finger length ratio. Now a new BBC internet study by the ‘finger professor’ John T. Manning has confirmed the earlier findings.

TITLE OF THE STUDY:

Digit ratio (2D:4D) and hand preference for writing in the BBC Internet Study.

SUMMARY OF THE STUDY:

“The ratio of the length of the second to the fourth digit (2D:4D) may be negatively correlated with prenatal testosterone. Hand preference has been linked with prenatal testosterone and 2D:4D. Here we show that 2D:4D is associated with hand preference for writing in a large internet sample (n>170,000) in which participants self-reported their finger lengths.”

“We replicated a significant association between right 2D:4D and writing hand preference (low right 2D:4D associated with left hand preference) as well as a significant correlation between writing hand preference and the difference between left and right 2D:4D or Dr-l (low Dr-l associated with left hand preference).”

“A new significant correlation between left 2D:4D and writing hand preference was also shown (high left 2D:4D associated with left hand preference). There was a clear interaction between writing hand preference and 2D:4D: The left 2D:4D was significantly larger than the right 2D:4D in male and female left-handed writers, and the right hand 2D:4D was significantly larger than the left hand 2D:4D in male and female right-handed writers.”

READ FURTHER ABOUT FINGER LENGTH & HANDEDNESS:

The origins of handedness
Your fingers reveal so much about you
The finger book – BOOK
Your left handed child – BOOK

What your hands reveal, what your eye may not see!

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Finger length.

Finger length appears to be related to body height.

Finger length relates to body height:

Earlier this year a Turkish study reported that in a sample of 386 right handed students, body height was found to correlate negatively with the right- and left hand digit ratios (significant for the left hand in men, and the right hand in women). This implicates that in both males and females evidence was found that a ‘low digit ratio’ is more frequently found in people who has a long body height.

SOME ADDITIONAL POPULATION EVIDENCE:

‘Finger Guru’ John T. Manning presented in his first book Digit Ratio an overview of data related to the ‘digit ratio’ in various populations. This data (Manning, Barley, et al.; 2000) points out that e.g. in Spanish & British people (both populations for both men and women) a significant HIGHER ‘2D:4D digit ratio’ (the ratio between the index- and ring finger) was found, compared to for example the finger ratios in Finish & German people (again in both populations for both men and women).

Interestingly, especially Spanish people, and in a lesser degree British people as well, are known for their (relatively) short body height – while Germans & Fins are known for their moderelately longer body height (compared to the Spanish & British): see the figure below. This implicates that there appears to be a strong link between the Turkish study which was published in 2008, and the earlier population evidence mentioned by Manning!!

Body height in various populations.

READ FURTHER ABOUT FINGER LENGTH & VARIOUS POPULATIONS:
Height, digit ratio and sex differences
The finger book
7 Milestones in the history of finger length research
Finger & digit ratio news
More hand news