Two lefties dating
Research on this topic suggests there may exist a weak association between ultrasound screening (sonography used to check on the healthy development of the fetus and mother during pregnancy) and left-handedness. and Australia have revealed that left-handed people differ from right-handers by only one IQ point, which is not noteworthy ...
In his book Right-Hand, Left-Hand, Chris Mc Manus of University College London argues that the proportion of left-handers is increasing and left-handed people as a group have historically produced an above-average quota of high achievers. Left-handers’ brains are structured differently from right-handers’ in ways that can allow them to process language, spatial relations and emotions in more diverse and potentially creative ways.
This theory also predicts that left-handed people have a reversed brain division of labor.
Nelson, Campbell, and Michel studied infants and whether developing handedness during infancy correlated with language abilities in toddlers.
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Handedness is a better (faster or more precise) performance or individual preference for use of a hand, known as the dominant hand; the less capable or less preferred hand is called the non-dominant hand.
Infants have been known to fluctuate heavily when choosing a hand to lead in grasping and object manipulation tasks.
This is especially shown when observing hand dominance in one versus two-handed grasping tasks.
18-36 month old children showed more hand preference when performing bi-manipulation tasks than simple grasping.