Journal ArticleDOI
Correlation between handedness and birth order: compilation of five studies.
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TLDR
To achieve a more powerful test of this relationship than has been provided by any single study, the data from the five studies which have considered it were pooled and tested and the resulting correlation between birth order and handedness was near zero.Abstract:
Bakan has suggested that left-handedness is the result of left hemishperic pyramidal motor dysfunction following perinatal hypoxia. To a degree support for the validity of this hypothesis rests on Bakan's (1971, 1977a) findings that left-handed college students were more likely the progeny of birth orders designated as "high-risk" than right-handed students. Attempts by others to replicate Bakan's data have been unsuccessful. To achieve a more powerful test of this relationship than has been provided by any single study, the data from the five studies which have considered it were pooled and tested. The resulting correlation between birth order and handedness was near zero.read more
Citations
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Journal ArticleDOI
Primate handedness reconsidered
Journal ArticleDOI
A large-scale population study of early life factors influencing left-handedness.
TL;DR: Analysis of genome-wide genotype data showed that left-handedness was very weakly heritable, but shared no genetic basis with birthweight, and although on average left- handers and right-handers differed for a number of early life factors, all together these factors had only a minimal predictive value for individual hand preference.
Journal ArticleDOI
Birth factors and laterality: Effects of birth order, parental age, and birth stress on four indices of lateral preference
Stanley Coren,Clare Porac +1 more
TL;DR: Three studies are presented which explore the laterality of not only hand but also foot, eye, and ear, in a total of 5161 individuals, in an attempt to assess any relationship to birth stress.
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Handedness in twins: a critical review.
TL;DR: Twins have not been shown to be subject to any special factors modifying their handedness and are thus suitable for genetic analysis, and the proportions of R-R, R-L and L-L pairs in MZ twins are not in a binomial distribution.
References
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Journal ArticleDOI
Pathological Left-Handedness: An Explanaory Model
TL;DR: A model was discussed which attempts to account for the raised incidence of manifest left-handedness in brain-injured populations, particularly mentally retarded and epileptic, and generated a number of testable hypotheses, some of which were logically derived from the model.
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Handedness and Birth Order
TL;DR: The frequency of left-handedness is greater in males and in twin births, both of which are also associated with greater birth and infant mortality and, in the case of males, a higher rate of spontaneous abortion, and the pre-natal and peri-natal periods seem to be more stressful for these groups.
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Left-handedness and early brain insult: An explanation
TL;DR: A Model is presented which could account for the present relationship between birth order and handedness and other reports of a raised incidence of left-handedness in brain-injured populations.
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Left handedness and birth order revisited
TL;DR: Left-handedness is seen as a result of left hemisphere pyramidal motor dysfunction following perinatal hypoxia and is seen in first and late births (4 or later).
Journal ArticleDOI
Handedness and birth risk.
TL;DR: No evidence of a relationship between left-handedness and birth risk was observed for male or female college students when these variables were taken into account.