Lefthanded

Lefthanded, also written as left-handed, refers to individuals whose preferred or dominant hand for performing tasks is the left hand. Handedness is a form of human laterality and can vary by activity. Some people are ambidextrous or exhibit mixed-handedness, using different hands for different tasks.

Approximately 10 to 12 percent of the population is lefthanded. The proportion is often higher among men than women in some studies, but cultural factors and reporting methods influence these estimates. Handedness typically becomes evident in early childhood and remains relatively stable into adulthood.

Biology and development: Handedness is linked to patterns of brain lateralization. Most right-handed people have language centers predominantly in the left hemisphere, while lefthanded individuals show greater variability, with a higher proportion of bilateral or right-hemisphere language representation. The causes are thought to involve a combination of genetic and environmental influences, with multiple genes and prenatal factors contributing.

Cultural and practical aspects: Across cultures, lefthandedness has carried a range of social meanings, from stigma to acceptance. Modern societies emphasize accommodation, and many everyday tools and interfaces are designed for right-handed use. Left-handed versions of certain instruments and spaces exist, and many tasks can be performed more comfortably with the left hand for lefthanded people.

Sports and performance: In some activities, lefthandedness can confer advantages due to rarity and differing strategic dynamics; in others, equipment or training may favor right-handed practitioners. No inherent cognitive disadvantage is linked to lefthandedness.

Health and research: Lefthandedness occurs in humans and other species. Research has explored associations with certain developmental or psychiatric conditions, but findings are inconclusive and do not establish causation.