One researcher estimates that if you considered a wide range of motor skills--writing, throwing, batting, eating, and so on--only about 7.5 percent of the population would turn out to be "pure" right-handers. Moreover, there is some dispute about what true left-handedness means. A few years ago a couple researchers at the University of Pennsylvania claimed to be able to detect two distinct kinds of left-handed writers--those who mirror the way right-handers hold their pencils, and those who "hook" when they write, i.e., curl their hands around so the pencil points toward the bottom of the page. The latter group, which is thought to comprise about 60 percent of all left-handed writers, is considered the hard-core element, in the sense that their neurological organization (according to the theory, at least) is substantially different from that of the general run of mankind. You undoubtedly recall that in humans you have what we call "contralateral neural control"--this scientific jive just slays me--in which the left side of the brain controls the right side of the body, and vice versa. In addition, in most people--righties and nonhooking lefties, anyway--the writing hand is located on the opposite side of the body from the brain's language center. In hooking left-handers, though, the writing hand and the language center supposedly are both located on the left side. This means that one side of the brain is taking care of business on both sides of the body (writing on the left, everything else on the right), which means it has to work harder than usual, which means it ends up either (a) extremely adept, or (b) extremely beat. This may explain the statistically documented fact that lefties tend to be either geniuses or idiots. I should know, because I'm a hooking left-hander myself.
— Cecil Adams
Food for thought.
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