A large-scale population study of early life factors influencing left-handedness
| العنوان: | A large-scale population study of early life factors influencing left-handedness |
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| المؤلفون: | Amaia Carrion-Castillo, Carolien G.F. de Kovel, Clyde Francks |
| المصدر: | Scientific Reports, Vol 9, Iss 1, Pp 1-11 (2019) Scientific Reports |
| بيانات النشر: | Nature Publishing Group, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Male, 0301 basic medicine, Season of birth, General Population Cohort, Breastfeeding, lcsh:Medicine, Biology, Left handedness, 050105 experimental psychology, Functional Laterality, Article, 03 medical and health sciences, 0302 clinical medicine, Genotype, Humans, Psychology, 0501 psychology and cognitive sciences, Association (psychology), lcsh:Science, Multidisciplinary, Geography, 05 social sciences, lcsh:R, Hand, Biobank, United Kingdom, Early life, 030104 developmental biology, Scale (social sciences), Population study, Female, Multiple birth, lcsh:Q, Psychomotor Performance, 030217 neurology & neurosurgery, Demography |
| الوصف: | Hand preference is a conspicuous variation in human behaviour, with a worldwide proportion of around 90% of people preferring to use the right hand for many tasks, and 10% the left hand. We used the large, general population cohort of the UK biobank (~500,000 participants) to study possible relations between early life factors and adult hand preference. The probability of being left-handed was affected by the year and location of birth, likely due to cultural effects. In addition, handedness was affected by birthweight, being part of a multiple birth, season of birth, breastfeeding, and sex, with each effect remaining significant after accounting for all others. Maternal smoking showed no association with handedness. Analysis of genome-wide genotype data showed that left-handedness was very weakly heritable, but shared no genetic basis with birthweight. 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. Therefore other, unknown effects must be involved, including possible environmental factors, and/or random developmental variation with respect to the left-right formation of the embryonic brain.Significance statementLeft-right laterality is an important aspect of human brain organization which is set up early in development. Left-handedness is an overt and relatively prevalent form of atypical brain laterality. Various, often related, early life factors have been previously studied in relation to handedness, but often in small samples, or samples with biased selection schemes. Here we have performed the largest ever study of left-handedness in relation to early life factors. Left-handedness was very weakly heritable and there were significant effects of various factors such as birthweight, which remained significant after controlling for all others. However, considered all together, early life factors still had poor predictive power for the handedness of any given individual. Very early developmental perturbations, caused by environmental or chance effects in embryonic development, are therefore likely to cause left-handedness. |
| وصف الملف: | application/pdf; application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| اللغة: | English |
| تدمد: | 2045-2322 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c53c6e829ce05462a7cd8abbd50a58f9 http://link.springer.com/article/10.1038/s41598-018-37423-8 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....c53c6e829ce05462a7cd8abbd50a58f9 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20452322 |
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