After various digit ratio studies found conflicting results related to Extraversion & sensation seeking (most pointed into the direction of a negative correlation), a new Dutch 2012 study suggest that other finger lengths require to be taken into account in order to find more clear results!

 The (unpublished) results from a female only suggest that low 2D:4D digit ratio + long pinky finger are much more often found in the hands of ‘extroverts’ (8 out of 40 hands = 20%), while this combination is rarely seen in the hands of ‘introverts (0 out of 28 hands = 0%).

Additionally, a high 2D:4D digit ratio with short pinky finger is much more common in the hands of ‘introverts’ (5 out 28 hands = 18%),  compared to the hands of ‘extroverts’  (3 out of 40 hands = 7.5%).

More details:

13 Hand signs for Extraversion / Introversion

What does finger length say about athletic ability? In a BBC project “Secrets of the Sexes” John T. Manning risked his reputation by participating in an experiment with six athletes: all 5000 meters specialists… the outcome is simply astonishing!

Professor John T. Manning explains how finger length relates to testosterone & athletic behavior.

Professor John T. Manning explains:

“… What I should be able to do is look at the differences between the ring finger and index finger, and on that basis rank these runners: first, second, third, fourth and so on. In theory that should work.”

Comment voice explains:

“In practice we’re providing professor Manning with photocopies of the athletes hands. And in return he’s risking his reputation by providing us with the results of a race that has yet to be run.”

You can now learn more about the fascinating ‘2D:4D digit ratio’: take a look at the outcome of this rather remarkable experiment – you will likely enjoy it, and probably… you will remember the outcome easily!!! (starting at 2:05 of the youtube video)

Finger length & sex I.D.: find out how your mind works!
Finger length & athletics: a secret your fingers reveal!
The hand of Usain Bolt – the fastest runner ever!

Usain Bolt has a low 2D:4D digit ratio.Jamaicans are known for having a low 2D:4D finger ratio.The olympic gold medal 4x 100m relay team from Jamaica.

Portrait of Giacomo Casanova by Anton Raphael Mengs.
Portrait of Giacomo Casanova by Anton Raphael Mengs (1768).

‘Giacomo Casanova had the long ring finger!’

Numerous references to variations in finger length patterns are found in the history of literature. However, none of the revelations are more lively than the informative comment in the memoirs of Giacomo Casanova (Jacques Casanova de Seingalt, 1725-1798) – who has been described as ‘world’s greatest lover’. Casanova where he recounts a conversation with the painter Anton Raphael Mengas (Casanova, 1794).

Peters et al. (2002) reported that Casanova made 2 clear statements: first, that the ring finger is relatively longer than the index finger and, second, that this is the case for both men and women. What follows is a quote from the work of Casanova (The Memoirs of Casanova: Spanish Passions) about one of his conversations with the German neoclassic painter Anton Raphael Mengs.


… Once I dared to tell him that he had made a mistake in the hand of one of his figures, as the ring finger was shorter than the index. He replied sharply that it was quite right, and shewed me his hand by way of proof. I laughed, and shewed him my hand in return, saying that I was certain that my hand was made like that of all the descendants of Adam.

“Then whom do you think that I am descended from?”
“I don’t know, but you are certainly not of the same species as myself.”
“You mean you are not of my species; all well-made hands of men, and women too, are like mine and not like yours.”
“I’ll wager a hundred doubloons that you are in the wrong.”

He got up, threw down brushes and palette, and rang up his servants, sayin,-

“We shall see which is right.”

The servant came, and on examination he found that I was right. For once in his life, he laughed and passed it off as a joke, saying-

“I am delighted that I can boast of being unique in one particular, at all events.”

BBC Test: finger length & sex I.D.!
Finger length & Cupid’s science!
The science of gaydar: finger length & sexual preference!
What they say about men with long ring fingers!

Giacomo Casanova's 'History of My Life' - part 1 to 12.

Is 2D:4D finger ratio research misleading?

Is 2D:4D finger ratio research misleading?

Is finger ratio research misleading / deceptive?

This week Czech researchers presented a revision of their earlier reported results: “previously published results on the 2D:4D ratio are biased by its covariation with finger length”. But the Czech researchers also reported very explicitely: “We do not claim that the previous results for the finger length ratio are wrong”.

What can we conclude from the latests step in finger ratio research?

What are the essentials of the Czech research? The Czech researchers claim that the fundamentals of the male-female 2D:4D finger length ratios can be related to male-female differences in finger length. Men usually have longer fingers (larger hand) than women – and there appears to be a negative correlation between finger length in general and the 2D:4D finger ratio.

The Czech research was presented under the title: ‘Differences in the 2nd to 4th digit length ratio in humans reflect shifts along the common allometric line’ – some quotes from the researchers about their finger ratio findings:

“Most studies agree that 2D:4D is sexually dimorphic.”

“Sexual differences in 2D : 4D are mainly caused by the shift along the common allometric line with non-zero intercept, which means 2D : 4D necessarily decreases with increasing finger length, and the fact that men have longer fingers than women.”

“We do not claim that the previous results for the finger length ratio are wrong”

“We conclude that previously published results on the 2D : 4D ratio are biased by its covariation with finger length. We strongly recommend regression-based approaches for comparisons of hand shape among different groups.”

Will the 2D:4D digit ratio become the new chiromancy?

Will the 2D:4D digit ratio become the new chiromancy?

Palmistry’s finger analogue: will the 2D:4D digit ratio become the new Chiromancy?

Chiromancy (cheiromancy), the notorious pseudoscience, has for two decades been creeping back into scientific favour. Is John T. Manning its new high priest?

The simplicity of the measure has inevitably launched a thousand research papers on hundreds of topics – including: heart attacks, breast cancer, running speed, football ability, sexual attraction, homosexuality, and schizophrenia.


How to understand the new Chiromancy? Hold up your right hand, and put your palm towards you and keep your fingers together; then measure the lengths of the 2th finger (index finger) and 4th finger (ring finger) – measure each finger from the tip to the crease where it joins the palm: see the picture below. Dividing the length of the 2th finger by the length of the 4th finger gives what in the jargon is known as the 2D:4D ratio!!!

Fingers of fate - 2D:4D ratio: how the measure the length of the index finger + ring finger?

Folk mythology has long suggested that men with large hands or feet will be well endowed, but there seems to be biological truth in that adage, with biologists finding that the same gene family, the Hox genes, underpins the development of “apical appendages”.

Professor John T. Manning says:

“I believe that the pattern and nature of our decline in middle life and the disease which will eventually lead to our death, is dependent to a large extent on our experiences as a foetus.”

The handedness-expert Chris McManon (psychologist from the UK) wrote a critical review of John T. Mannings ‘digit ratio’ work. You can read the full review via:

Palmistry’s digital analogue: is 2D:4D finger ratio the new Chiromancy?
The finger book – about the 2D:4D digit ratio
Hands up: what your fingers reveal about you
Digit ratio: a pointer to fertility, behavior and health
More digit ratio and finger length news

The fingers of Albert Einstein.

The fingers of Albert Einstein.

Albert Einstein has a ‘2D:4D finger ratio’ of 0.93:

In 1930 a German hand reader, Marianne Raschig, has taken the handprints of Albert Einstein (he was born in Germany) and one year later they were presented in her book: ‘Hand und Persönlichkeit’.

Almost 80 years later the ‘2D: 4D digit ratio’ (ratio between the index finger & ring finger) is now measured from the high quality handprints.

Einstein had a ‘2D:4D finger ratio’ of: 0.93

The high quality handprints of Albert Einstein can found in the article:
Handprints: the hands of Albert Einstein

The picture below is also taken from the German book. The results of a detailed measurement procedure (taken by a Dutch psychologist) indicates that the ‘2D:4D digit ratio’ is for both hands: 0.93.

This is especially interesting because researchers at Cambridge and Oxford universities believe Albert Einstein displayed signs of autism (Asperger syndrome). Earlier research on finger length & autism has indicated that a low digit ratio (0.94 or lower) highers the chance for the presence of autism!

Therefore it seems fair to conclude that the fingers of Einstein provide evidence which support the perceptions of the UK researchers who suspect that Albert Einstein had autism!

The handprints of Albert Einstein.

What can we learn from our fingers & finger length?
The curved little finger & autism
Finger length (low digit ratio) related to autism
More fingerprints news
Global news about hand reading & palmistry

Finger length shows your talent for math / literacy.

Finger length shows your talent

Parents can possibly predict their children’s exam performance simply by looking at their hands. British psychologists have linked the results in English and maths tests to the finger length of 7 year old Briths schoolchildren. Pupils with a longer ring finger appear to be more likely to have a talent in math, while those with a shorter ring finger are more likely to have a talent in literacy.

Mark Brosnan, one of the British researchers at the University of Bath, said:

“Testosterone has been argued to promote development of the areas of the brain which are often associated with spatial and mathematical skills.”

“Oestrogen is thought to do the same in the areas of the brain which are often associated with verbal ability. Interestingly, these hormones are also thought to have a say in the relative lengths of our index and ring fingers. We can use measurements of these fingers as a way of gauging the relative exposure to these two hormones in the womb. And, as we have shown through this study, we can also use them to predict ability in the key areas of numeracy and literacy.”

The research project has been published in the British Journal of Psychology. The finger lengths of 75 seven-year-olds British schoolchildren was measured by using photocopies of both their right- and left palm.

Using the scores presented by ‘key stage’ English and maths tests, the researchers compared the measurements of the study group with their performance in the classroom. The researchers found that children with smaller digit ratios – a longer ring finger compared to the finger (+ a greater pre-natal exposure to testosterone) – were more likely to be better at maths than English.

Finger length shows how a pupil will do in maths or English.
Finger length linked to autism.
Giving science the finger
News about your hands

Gay men and lesbians tend to have 'reversed' ratios.

Index fingers of most straight men are shorter than the ring fingers; most straight women have the same length or index longer. Gay men and lesbians tend to have reversed ratios.

We all know that the body length of males is usually longer than the body length of females. Scientists call this difference between the sexes: a ‘sexually dismorphic trait’.

 The picture below describes some details of this male-female dimorphic trait: about 75% of men are longer than about 75% of females.

About 75% of males are longer than 75% of females.
John Manning reported in his first book, titled: Digit Ratio that a likewise ‘sexually dimporphic trait’ is noticed in the hands. In the hands of men, the index finger tends to be shorter than the ring finger. And in the hands of women the index finger tends to be the same size (or slightly longer) than the ring finger.

The picture below describes some details of this ‘sexually dimorphic trait’ in the hand: in about 75% of men the ring finger is longer than the index finger; however in females the percentage is about 50%.

About 75% of males have a digit ratio lower than '1.00'; in females this percentage is about 50%.
Interestingly, John Manning also has pointed out that various studies have indicated that the relative lengths of our fingers offer a hint related to the sexual preference of a person!

For, as expected the index fingers of most straight men appear to be shorter than their ring fingers, while for most straight women the length of both fingers is closer to equal, or even reversed in ratio. But some researchers have noted that gay men are likely to have finger-length ratios more in line with those of straight women, and a study of self-described “butch” lesbians showed significantly masculinized ratios. An overview of these results is presented in the picture below:

Researchers have found a link between index and ring finger lengths and homosexuality.

An overview of the scientific sources which have found a link between finger length and sexual preference:

* Hand asymmetry in heterosexual and homosexual men and women: relationship to 2D:4D digit ratios and other sexually dimorphic anatomical traits. – 2008

* The effects of sex, ethnicity, and sexual orientation on self-measured digit ratio (2D:4D). – 2007

* Digit ratio (2D:4D) in homosexual and heterosexual men from Austria. – 2005

* 2nd to 4th digit ratio and a universal mean for prenatal testosterone in homosexual men. – 2003

* The ratio of 2nd to 4th digit length and male homosexuality. – 2000

* Finger length ratios and sexual orientation – 2000


Illustration from the last study (Williams, 2000):

Your hands & your sex life

Your hands & your sex life

Cupid’s Science

Anthropologist Helen Fisher explains what online dating sites can learn from the biology of love and what the length of your ring finger says about your sex life.

Last year you may have seen ads for, the ones about people who have been rejected by online matchmaking sites like eHarmony for being gay, depressed, or generally unmarriageable for murkier reasons. In one ad, a young man stares hopefully at heterosexual p o r n, only to conclude, “Nope, still gay.” At Chemistry, spokespeople like to crow, you can “come as you are” (as long as you come as someone who is over 18).

The company is an offshoot of Internet meet-market, which has been around since 1994. In 2004, Match approached anthropologist Helen Fisher about designing a site where, like at the successful but restricted eHarmony, members would not shop blindly for dates, but would be matched with each other based on personality profiles and compatibility.

Fisher, whose work on s e x, love and the brain had made her an authority on human mating, developed a theory that human beings fall into four categories – negotiators, directors, explorers and builders – and that your type helps determine who you fall for.

Passage in the interview:

RT: What is this thing about your fingers? It’s on the Chemistry questionnaire.

HF: It’s called ‘digit ratio’ (finger length ratio). In the womb – during pregnancy – the brain is washed over by estrogen and testosterone. If you have a lot more testosterone than estrogen in the womb, it is going to build a longer fourth finger than pointer finger. If you’ve got a lot more estrogen in the womb, the pointer finger will be longer.

RT: What does it say about your personality?

HF: If you have more testosterone in the womb and you have a longer fourth finger, you’re more likely to have musical ability, mathematical abilities, to be an engineer or architect or good at computer programming. You tend to have poorer social skills but be direct, decisive, ambitious, competitive.

Cupid’s Science

Digit ratio and sexual preference.

Emma Nelson

Emma Nelson studies

‘Digit ratio’ in non-human primates:

‘Digit ratio’ research is not limited to the human hand. Emma Nelson from Department of Archaeology, University of Liverpool is one of the key-researchers who studies ‘digit ratio’ in the hands of primates.

The major focuss in Emma Nelson’s ”digit ratio’ research in primates is:

“Using digit ratios (2D:4D) to investigate social systems in anthropoids; implications for the study of the evolution of hominin sociality.”.

Variation in non-human primate 2D:4D is currently unknown. One of the aims of this project is to map differences in mean 2D:4D within and between non-human primates species.

Digit ratio in non-human primates