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Handedness can result from asymmetry in the motor cortex of one hemisphere. For right handed individuals, since the brain operates the contralateral side of the body, they could have a more induced motor cortex in the left hemisphere. Several diseases have been found to exacerbate brain asymmetries that are already present in the brain.
Language areas are represented unilaterally in the human brain. [3] In around 95% of right-handers, these brain areas are often located on the left hemisphere, however the proportion reduces in left handers down to around 70%. [2] Therefore 7 in every 100 individuals is right-hemisphered for language and left-hand dominant. [4]
The right side of the brain was seen as the inferior and thought to be prominent in women, savages, children, criminals, and the insane. A prime example of this in fictional literature can be seen in Robert Louis Stevenson's Strange Case of Dr. Jekyll and Mr. Hyde. [35]
In the sport of cricket, some players may find that they are more comfortable bowling with their left or right hand, but batting with the other hand. Approximate statistics, complied in 1981, are given below: [4] Favoring right hand: 88.2%; Favoring right foot: 81.0%; Favoring right eye: 71.1%; Favoring right ear: 59.1%; Same hand and foot: 84%
Into the 20th and even the 21st century, left-handed children in Uganda were beaten by schoolteachers or parents for writing with their left hand, [122] or had their left hands tied behind their backs to force them to write with their right hand. [123] As a child, the future British king George VI (1895–1952) was naturally left-handed. He was ...
a) The right hemisphere has more control over emotion than left hemisphere. [n 2] b) The right hemisphere is dominant in emotional expression in a similar way that the left hemisphere is dominant in language. c) The right hemisphere is dominant in the perception of facial expression, body posture, and prosody.
The KNOB is also a suggested cortical substrate of the hand, as there have been anatomical asymmetries which have been linked to hand preference and skill, further suggesting the development of hands in the formation of the central sulcus seeing as the KNOB is the central portion of the central sulcus folded over the buried gyrus. [2]
A, B: The early embryo turns onto its left side; B, C: Symmetry is retained by a further left turn in the anterior head region and a compensating right turn in the rest of the body. D, E: Growth of the optic tract leading to the optic chiasma. Colors refer to early embryo: Red=right side, blue=left side, black=dorsal, white=ventral.