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habitual or more skillful use of one hand as opposed to the other. Approximately 90% of humans are thought to be right-handed. It was traditionally argued that there is a slight tendency toward asymmetrical physiological development favoring the right side of the body, and that the center of gravity is to the right of the body's midline. This, however, would seem to be the consequence of greater dependence upon the right hand rather than the cause of right-handedness.

The neurological argument holds that since the right and left sides of the body are controlled by the opposite hemispheres of the brain, the greater development of the left hemisphere results in right-handedness. Anatomical studies have demonstrated that Broca's center, the area of the cerebral cortex that controls speech and muscular coordination, is almost always better developed in the left hemisphere in right-handed individuals; in 70% of left-handed individuals these centers are located in the right brain. Psychologists have raised the possibility of a cultural explanation. Although young children can be trained to prefer the right hand against a natural inclination, there is evidence that handedness is hereditary and that denser neurological connections extending from one side of the brain or the other are present from birth. A cultural explanation is also challenged by the evidence that some other vertebrates demonstrate a preference for one hand or paw over the other.

Although it is not clear that culture is a causative agent in handedness, it is certain that the high incidence of right-handedness has shaped human society in almost every conceivable aspect. Tools, machinery, and even clothing are largely designed for the right-handed, and until fairly recently, many left-handed individuals were strongly encouraged to switch to right-handedness. In some cultures the left-handed were thought to be evil or to bring bad luck.


A division of objects, such as coordinate systems, screws, and circularly polarized light beams, into two classes (right and left), which distinguishes an object from a mirror image but not from a rotated object.
References in periodicals archive ?
The research summarized above on both the issues of sidedness and conclusiveness has been conducted in the U.
As one of the first studies on message sidedness and conclusiveness across two cultures, the researchers are interested to see how culture, particularly the different ways of thinking and information processing cultivated by the cultures, moderates the effects of the advertising sidedness and conclusiveness.
Two manipulation check questions designed to test the stimulus of sidedness and conclusiveness did not show significant results with t-tests, which means, for instance, respondents exposed to the one-sided ad did not perceive their ad as particularly one-sided.
This guaranteed separation can provide a satisfactory assurance that the triangulation points on the hemisphere will be sufficiently far from being co-planar to allow unambiguous determination of the sidedness of other sphere points with respect to cutting planes.
c) Update the coefficients and the sidedness criteria of the convex hull triangular facet bounding planes.
This pseudo-code does not describe explicitly how to perform the sidedness tests, but there are several observations that may facilitate the tests.
Now, in order to assess the sidedness of a marriage network core, we need to examine whether the independent circuits linking the unilineal groups it contains close at an even or an odd number of affinal ties.
All else being equal, a given sidedness rate for a marriage network core containing a large number of circuits is more significant than the same rate for a core with a smaller number of circuits.
The highest rates of sidedness are found among the Groote Eylandt Winindiljangwa (100 per cent virisided), the Alyawarre (98 per cent viri-sided and 95 per cent uxori-sided) and the Adnyamathanha (92 per cent uxori-sided), the lowest among the Nyungar (67 per cent uxori-sided).
At first glance, it may appear that our procedure "fixes" some mis-positioning at the expense of introducing new sidedness conflicts.
If the sum is even (including zero), then the sidedness is correct, and we say that the parity is positive.
We have seen that we can readily test to see if adding the point (and possibly others to follow) is necessary to correct a sidedness flaw resulting from having segment [e.