Talk:Handedness

nonsense

70-90% right handed, 10% lefthanded. 30% both. Shame.

at least say stas are divided.

Shared material with left-handed

Moved to Talk:Laterality#From Talk:Handedness.23Shared material with left-handed. Please go there to continue merger discussion.

The removed material spans 10:25, 25 Jan 2005 to 03:12, 11 February 2006, and was moved from here at 10:27, 11 March 2006.

Proposed merger

Moved to Talk:Laterality#Merger proposal. Please go there to continue merger discussion.

The removed material spans 02:55, 11 February 2006 to 10:16, 11 March 2006, and was moved from here at 2006-03-11 10:27:30

/* Genetic factors */ deletion due to failed verification

This statement does not correlate with the citations provided.

"Other mechanisms may play a role in handedness, for example hormone signalling. Medland et al.[21] found a CAG repeat length variant in the androgen receptor gene (AR) that is positively correlated with left-handedness in females, and negatively correlated in males. This same variant is positively correlated with testosterone levels in males, and negatively correlated in females." This may help to explain why there are more left-handed men than women (around 12% in men versus 10% in women globally).[3] However, another study has found that this variant is instead associated with mixed-handedness in males (and not left-handedness), conflicting with the original results.[22]

One citation provided is a meta-study, that doesn't give explanation on why "left handedness" is more prevalent in males, just that it is more prevalent in males, the other citation provided states the exact opposite of the above text:

Behav Genet. 2005 Nov;35(6):735-44. Opposite effects of androgen receptor CAG repeat length on increased risk of left-handedness in males and females.

"Likelihood of left handedness increased in those individuals with variants of the androgen receptor associated with lower testosterone levels"

"thats left" means correct.Only 10 percent of exceptional creative genius in the world

Yes handiness means skilled. So for people who write with the left, using the right means wrong. With a likelihood to be more clumsy.

Still I like that many can use both efficiently.There are so many tasks that include both fine motor and gross motor skills that every one should have a different preference fro writing, chopping wood and use both for carrying things. The truly dumb would open a fridge door, take out the juice, put it on the counter and then closed the door using only one hand.Forcing people to convert caused enough loss, but to limit your self to the concept of being right handed or left-handed when we have two is truly disabling.

American Geography of Left Handedness

An interesting article on the the Geography of left handedness here, with a thematic map and chart. While a curiosity, not certain if fits into the article.RomanGrandpa (talk) 13:28, 24 September 2015 (UTC)

Doesn't add up

It says in the intro that ""70-90%" of the population is left-handed. Later, an (uncited) section states that:

  "Interactive sports such as table tennis, badminton, cricket, and tennis have an overrepresentation of left-handedness, while non-interactive sports such as swimming show no overrepresentation. Smaller physical distance between participants increases the overrepresentation. In fencing, about half the participants are left-handed.[34]

  The advantage to players in one-on-one sports, such as tennis, boxing, fencing or judo, is that, in a population containing perhaps 10% left-handers and 90% right-handers, the left-hander plays 90% of his or her games against right-handed opponents and is well-practiced at dealing with this asymmetry. Right-handers play 90% of their games against other right-handers. Thus, when confronted with left-handers, they are less practiced (see Rafael Nadal). When two left-handers compete against each other, they are both likely to be at the same level of practice as when right-handers play other right-handers. This explains why a disproportionately high number of left-handers are found in sports in which direct one-on-one action predominates.[citation needed]"

This contradicts on two levels. First, if the number varies between 70 and 90% of the population, then "over-representation" in contact sports would mean that there is MORE than 10% of the participants that are left handed. 10% would be the very minimum, even if left-handers weren't over-represented. And if you take 30% to be the % of the population, then "overrepresented" could mean 40% of players are leftys, which would pretty much nullify the theory that rightys aren't used to playing leftys.

The next is that is says that a left hander "should be just as used to facing a left hander as a right-hander is to facing a right-hander". If a left-hander is used to facing right handers, because there is more of them, and right-handers are not used to facing left handers, then why would left handers be used to facing left handers? Statistically, a left hander should be facing another left hander 10% of the time, just like a right-hander. That would mean that a left hander is no more used to facing another left hander than a typical right hander is. Makes no sense. Best you could say is that a left-hander facing a left-hander is basically like a right-hander facing a right-hander, except any left-hander ought to much more accustomed to facing RIGHT-HANDERS, since they face 9 of them for every 1 left-hander they face, just like any right-hander. If anything, a left-hander facing a left-hander is at just as much a disadvantage as a right-hander facing a left-hander...except that he OTHER guy is equally at a disadvantage, which MIGHT cancel each other out. So they are both at a disadvantage, which would give the same results (theoretically) as a right-right match...so the statement is accurate theoretically (although dubious), but not for the reason stated. And that's IF you accept the "90%" number, which doesn't jive with the claim that they are "over-represented"..45Colt 10:33, 14 November 2015 (UTC)

You must have misread the statement. It reads: "Right-handedness is most common. Right-handed people are more skillful with their right hands when performing tasks. Studies suggest that 70–90% of the world population is right-handed.[4][5]" It's usually a goof idea to copy and paste the sentence if no other reason to be sure you read it right (or is it left?) __209.179.0.121 (talk) 04:14, 24 November 2015 (UTC)