Classification edit
Mixed-handedness edit
Human handedness exists on a spectrum ranging from complete left- to complete right-handedness. Unlike ambidexterity, where there is no preference between hands, mixed-handed individuals perform some tasks with their left hand and others with their right.[1] Tests such as the Annett Hand Preference Questionnaire assess individuals' degrees of handedness, with Class 1 being purely right-handed and Class 8 purely left-handed. Narrow definitions of mixed-handedness limit the classification to individuals scoring in Classes 5 and 6, while broader definitions include those who fall between Classes 2 and 7.[2]
Mixed laterality edit
In addition to hand preference, most individuals show a preference for the use of one eye over the other, a tendency called ocular dominance.
Causes edit
There is some correlation between prenatal stress and cross-dominance, as the offspring of mothers who reported high levels of stress during the third trimester of pregnancy showed higher prevalence of mixed-handedness.[3][4]
Mechanism edit
Epidemiology edit
Society and culture edit
Athletic performance edit
In baseball, eye–hand cross-dominant batters are better able to track the ball as it crosses the plate. This is because their blind spot TKTKTK.[5]
While eye-hand cross-dominance has no effect on the ability of children to catch objects in both hands, cross-dominant individuals have more difficulties catching objects in one hand.[6]
Musical ability edit
Some evidence suggests that mixed-handedness is more prevalent in musicians whose instruments require bimanual integration, such as strings and woodwinds, rather than keyboard instruments in which the hands operate independently.[7]
References edit
- ^ Annett, Marian (August 1970). "A classification of hand preference by association analysis". British Journal of Psychology. 61 (3): 303–321. doi:10.1111/j.2044-8295.1970.tb01248.x. Retrieved July 21, 2022.
- ^ Giotakos, Orestis (December 1, 2001). "Narrow and broad definition of mixed-handedness in male psychiatric patients". Perceptual and Motor Skills. 93 (3): 631–638. doi:10.2466/pms.2001.93.3.631. Retrieved July 21, 2022.
- ^ Obel, Carsten; Hedegaard, Morten; Henriksen, Tine Brink; Secher, Niels Jorgen; Olsen, Jorn (August 2003). "Psychological factors in pregnancy and mixed-handedness in the offspring". Developmental Medicine & Child Neurology. 45 (8). doi:10.1111/j.1469-8749.2003.tb00956.x. PMID 12882535. Retrieved July 23, 2022.
- ^ Gutteling, Barbara M.; de Weerth, Carolina; Buitelaar, Jan K. (November 2007). "Prenatal Stress and Mixed-Handedness". Pediatric Research. 62: 586–590. doi:10.1203/PDR.0b013e3181558678. Retrieved July 23, 2022.
- ^ Bahill, A. Terry (2019). "The Advantage of Eye–Hand Cross-Dominance for Baseball Batters". The Science of Baseball: Batting, Bats, Bat-Ball Collisions, and the Flight of the Ball (2nd ed.). Cham, Switzerland: Springer Nature Switzerland. pp. 253–277. doi:10.1007/978-3-030-03032-2_10. ISBN 978-3-030-03032-2.
- ^ Ziyagil, M. Akif; Kesilmis, Inci; Demirci, Nevzat; Kesilmis, M. Melih (2017). "Effects of ipsilateral and crossed eye-hand dominance on catching performance in prepubescents". New Trends and Issues Proceedings on Humanities and Social Sciences. 4 (5): 41–48. doi:10.18844/prosoc.v4i5.2673. ISSN 2547-8818. Retrieved July 20, 2022.
- ^ Christman, Stephen (July 1993). "Handedness in Musicians: Bimanual Constraints on Performance". Brain and Cognition. 22 (2): 266–272. doi:10.1006/breg.1993.1038. Retrieved July 29, 2022.
