El cuerpo del delito

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Right-handedness may have become dominant in humans because it makes it easier to deliver fatal stabs to an opponent. The modified fighting hypothesis proposes that most humans are right-handed because it conveyed an advantage during intraspecific fights with sharp weapons, due to the leftward location of the heart and aorta. We conducted a comprehensive examination of the literature on assault with a sharp weapon to ascertain whether a particular body region, and side of the body, was penetrated more than any other, and whether the body region was associated with an increase in mortality. An examination of the literature on sharp force injury showed that the thoracic region is penetrated more than any other region, and the left thorax is penetrated approximately 2.4 times more often than the right thorax. Handedness influenced the side of the thorax targeted, with most right-handers penetrating the left thorax in front of their right hand. As two thirds of the heart is in the left thorax, right-handers appear more likely to injure the heart and other vital structures, increasing their Taken together, this evidence suggests that the asymmetry of the heart and the handedness of an assailant can influence the outcome of agonistic interactions with sharp weapons. This difference in lethality may have resulted in a survival advantage for right-handers. It is unclear when hominins first used sharp weapons, but it is possible that sharp wooden weapons were used for millions of years. Increased use of sharp weapons in hominins [may have] caused evolutionary changes in anatomical traits, reducing sexual dimorphism and increasing population-level right lateralization. Right lateralization in humans may provide a fighting advantage when they use sharp weapons, resulting in right-handedness becoming the majority in human populations. In other circumstances, when sharp weapons are not used, and do not convey a disadvantage to left-handers, such as in hand-to-hand fighting, left-handers might have a fighting advantage because of their rarity.