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

at least say stas are divided. — Preceding unsigned comment added by Danja (talkcontribs) 21:22, 24 January 2015‎

/* Genetic factors */ deletion due to failed verification[edit]

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"

— Preceding unsigned comment added by (talkcontribs) 18:26, 12 November 2013‎

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

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.

— Preceding unsigned comment added by (talkcontribs) 03:53, 6 May 2015‎

"This is common in the population with about a 1% prevalence"[edit]

I think that this refers to ambidextrous individuals, not cross-dominant ones. The article ambidexterity calls out this statistic, but the cross-dominant article has no such statistic. Can someone check the source? Kortoso (talk) 22:01, 20 October 2016 (UTC)

"handedness is an outward reflection of brain asymmetry for motor function"[edit]

Is this true, or is there at least consensus about this? If it is then shouldn't such a statement be promoted (e.g. from the "theories" section to the lede) to make that clear? Especially since this seems to be an implied assumption in several other places in the article.

And otherwise, i.e. if it is "merely" an assumption that is part of one or more of the several theories, shouldn't it be stated as such (rather than as a parenthetical but undisputed fact, buried inside the description of a theory)? AlexFekken (talk) 06:35, 30 December 2016 (UTC)