October 15, 2012
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The (unpublished) results from a female only suggest that low 2D:4D digit ratio + long pinky finger are much more often found in the hands of ‘extroverts’ (8 out of 40 hands =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%).
March 5, 2010
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:
“… 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)
SUGGESTIONS FOR FURTHER READING:
February 8, 2010
Portrait of Giacomo Casanova by Anton Raphael Mengs (1768).
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.
QUOTE FROM CASANOVA (1794):
… 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?”
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.”
SUGGESTION FOR FURTHER READING:
June 26, 2009
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.”
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.
|THE NEW CHIROMANCY
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!!!
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:
• 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
January 29, 2009
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:
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!
READ FURTHER ABOUT FINGER TECHNOLOGY:
November 8, 2008
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.
October 19, 2008
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.
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%.
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:
An overview of the scientific sources which have found a link between finger length and sexual preference:
Illustration from the last study (Williams, 2000):
October 5, 2008
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 Chemistry.com, 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 Match.com, 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.
September 29, 2008
‘Digit ratio’ in non-human 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.