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==Causes of left-handedness== |
==Causes of left-handedness== |
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− | [[File:Handedness Ratio of the World Population.PNG|350px|thumb|The average ratio of left-handers is 12% in the world. With right-handers at 87% of the population, and ambidextrous at less than 1%]] |
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{{Main|Handedness}} |
{{Main|Handedness}} |
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* Hand orientation is developed in fetuses, most commonly determined by observing which hand is predominantly held close to the mouth.<ref>Hopkins, B., Lems, W., Janssen, B. & Butterworth, G. (1987) Postural and motor |
* Hand orientation is developed in fetuses, most commonly determined by observing which hand is predominantly held close to the mouth.<ref>Hopkins, B., Lems, W., Janssen, B. & Butterworth, G. (1987) Postural and motor |