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L
Laterality The tendency for the left side and the right side of the brain and the body to develop special functions.

Examples:
Most people use either their right hand or their left hand for writing. Very few people can use both. Most right-handed people have their language abilities concentrated in the left hemisphere of the brain.

Laterality develops throughout childhood. Babies and very young children often use their hands indiscriminately, but by adolescence laterality is usually fully established.