Cross-dominance, also known as mixed-handedness, mixed dominance, or hand-confusion, is a motor skill manifestation where a person favors one hand for some tasks and the other hand for others. For example, a cross-dominant person might write with the left hand but throw primarily with the right. Ambidexterity is a well-known but rare variant of cross-dominance, but cross-dominant people may also be left or right-handed rather than ambidextrous.
It can also refer to mixed laterality, which refers to a person favoring eyes, ears, feet, or hands on one side of the body. A person who is cross-dominant can also be stronger on the opposite side of the body that they favor; for example, a right-handed person can be stronger on the left side. Cross-dominance can often be a problem when shooting or in activities that require aim, although athletes can still achieve success in sports that require accuracy, like passing in American football and shooting in basketball.
In baseball 
Because curveballs and sliders – the most commonly used breaking pitches in the game – curve in the direction of a pitcher's non-throwing hand, a batter who bats from the same side of home plate as the pitcher's non-throwing hand enjoys an advantage. In turn, since most pitchers are right-handed, this means that left-handed batters enjoy a noticeable advantage over their right-handed counterparts. However, being a right-handed thrower is more advantageous in the field. Every fielding position can be played by a right-handed thrower, although left-handers enjoy a slight advantage at first base. Conversely, left-handed throwers are completely absent at the highest level at the other infield positions and at catcher. While switch hitting exists so a batter can put pressure on a pitcher by hitting the opposite hand of the pitcher’s throwing arm, it has gained some criticism because a batter will always be more dominant from one side of the plate than the other; therefore, depending on the throwing hand of a pitcher, the switch hitter may be unreliable. So, many baseball players are trained at being cross-dominant, with batting solely left-handed and throwing solely right-handed to suffice to this advantage. There are also players like Rickey Henderson, who bat right and throw left; but this serves as a substantial disadvantage and is only done because the player is simply just more comfortable playing that way, which demonstrates that cross-dominance in the sport can sometimes be natural instead of being a strategy.
This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "article name needed". Cyclopaedia, or an Universal Dictionary of Arts and Sciences (first ed.). James and John Knapton, et al.
|In cognitive abilities||Geschwind–Galaburda hypothesis|
|In brain||Brain asymmetry · Dual brain theory · Bicameralism|
|In eyes||Ocular dominance|
|Handedness in boxing||Southpaw stance||Orthodox stance|
|Handedness in people||Musicians · US presidents|
|Handedness related to||Sex · Maths|
|Handedness measurement||Edinburgh Handedness Inventory|
|In major viscera||Situs solitus||Situs ambiguus||Situs inversus|