Nongenetic factors associated with human handedness and footedness in Japanese twin children

Ooki, Syuichi

doi:10.1007/bf02898021

Cited by 18 publications

(23 citation statements)

References 37 publications

(42 reference statements)

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“…Although not impossible, it is very improbable that postnatal effects fully explain our results. One previous twin study found a lower prevalence of left footedness in females from opposite-sex pairs compared to females from same-sex pairs (Ooki, 2006). Relating to laterality, another twin study found that OSF twins had a right ear advantage on a dichotic listening task more often than SSF twins (Cohen-Bendahan et al, 2004).…”

Section: Discussionmentioning

confidence: 86%

“…A second twin study reported no significant difference in left-handedness between females from opposite-sex and same-sex pairs in two separate samples (Ooki, 2006). In the first sample (N=1131, age 11–12) the prevalence of the left-handedness in opposite-sex females was 5.6% and 11.6% for same-sex female twins.…”

Section: Introductionmentioning

confidence: 95%

“…To date, two studies (Elkadi et al, 1999; Ooki, 2006) have directly compared the rate of left-handedness between females from opposite-sex and same-sex twin pairs. Both studies tested the GBG hypothesis under the assumption that the prevalence of left-handedness would be increased in opposite-sex female twins if prenatal testosterone exposure occurs.…”

Section: Introductionmentioning

confidence: 99%

“…In this sample, the age of the subjects (N=951) ranged from 1 to 15 years, despite the fact that handedness is not necessarily established in children below 6 years of age (Bryden et al, 2000). In the Ooki (2006) study, handedness was measured by mother’s report of which hand a twin used to write a letter and footedness by mother’s report of which foot a twin used to kick a ball. Twins who were reported to use both hands/feet were treated as left-handers/left-footed.…”

Section: Introductionmentioning

confidence: 99%

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Decreased prevalence of left-handedness among females with male co-twins: Evidence suggesting prenatal testosterone transfer in humans?

Vuoksimaa

Eriksson

Pulkkinen

et al. 2010

Psychoneuroendocrinology

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SummaryStudies of singletons suggest that right-handed individuals may have higher levels of testosterone than do left-handed individuals. Prenatal testosterone levels are hypothesised to be especially related to handedness formation. In humans, female members from opposite-sex twin pairs may experience elevated level of prenatal exposure to testosterone in their intra-uterine environment shared with a male. We tested for differences in rates of left-handedness/right-handedness in female twins from same-sex and opposite-sex twin pairs. Our sample consisted of 4736 subjects, about 70% of all Finnish twins born in 1983-1987, with information on measured pregnancy and birth related factors. Circulating testosterone and estradiol levels at age 14 were available on 771 and 744 of these twins, respectively. We found significantly (p<.006) lower prevalence of left-handedness in females from opposite-sex pairs (5.3%) compared to females from same-sex pairs (8.6%). The circulating levels of neither testosterone nor estradiol related to handedness in either females or males. Nor were there differences in circulating testosterone or estradiol levels between females from opposite-sex and same-sex twin pairs. Birth and pregnancy related factors for which we had information were unrelated to handedness. Our results are difficult to fully explain by postnatal factors, but they offer support to theory that relates testosterone to formation of handedness, and in a population-based sample, are suggestive of effects of prenatal testosterone transfer.

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Decreased prevalence of left-handedness among females with male co-twins: Evidence suggesting prenatal testosterone transfer in humans?

Vuoksimaa

Eriksson

Pulkkinen

et al. 2010

Psychoneuroendocrinology

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“…When present study was performed, this school did not have an ethical committee for the twin study, which is now under construction, including the author as one of the advisers. Zygosity diagnosis using DNA sample was permitted through the ethical committee of the Graduate School of Medicine, University of Tokyo [51]. All the mothers in the maternal association group cooperated voluntarily in this research, mainly through the presidents of their associations [51].…”

Section: Ethical Issuesmentioning

confidence: 99%

Breast-feeding rates and related maternal and infants’ obstetric factors in Japanese twins

Ooki

2008

Environ Health Prev Med

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Objectives The aims of the present study are to describe the secular trend of breast-feeding rates in Japanese twins in comparison with the general population, and then to clarify the maternal and infants' obstetric factors associated with breast-feeding in twins. Methods Breast-feeding rates from 0 to 6 full months and related maternal and infant obstetric factors were analyzed using 4,023 Japanese twins, consisting of two different volunteer-based twin samples, age 1-15 years, whose birth year ranged from 1968 to 2003. Data were collected through mailed or hand-delivered questionnaires. Obstetric factors that affect full and partial breast-feeding of twins were confirmed using logistic analyses according to birth order in twin pairs, adjusted by birth year. Results The full breast-feeding rates of twins were lower than those of the general population. On the other hand, the combined rates of full and partial breast-feeding were close to those of general population, except for the period 1968-1974. The percentage of concordance pares was around 95% for all months. The most influential factor that negatively correlated with breast-feeding from 0 to 6 months was gestational weeks. Higher maternal age at twin birth and the use of an incubator also prevented breast-feeding in the neonatal period. Conclusions The results of the present study for the first time indicated that full breast-feeding of twins has risen recently in Japan, although the rates are still lower than those of the general population. The importance of the gestational weeks for breast-feeding rates was also shown.

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Mirror, mirror? An evaluation of identical twin mirroring in tooth crown morphology

McCrary,

Hughes,

Brook

et al. 2024

The Anatomical Record

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It has been estimated that 25% of monozygotic (“identical”) twin pairs exhibit reverse asymmetry (RA) or “mirroring” of minor anatomical features as a result of delayed zygote division. Here, we examine whether identical twin mirroring accounts for patterns of dental asymmetry in a sample of monozygotic and dizygotic (“fraternal”) twins. We focus on crown morphology to approach the following question: is there an association between dental RA frequency and twin type suggestive of the presence of mirror image twins in our sample? Data were collected from 208 deciduous and 196 permanent dentitions of participants of the University of Adelaide Twin Study using Arizona State University Dental Anthropology System standards. RA frequencies were compared across morphological complexes (deciduous, permanent), twin types (monozygotic, dizygotic), and traits. Fisher's exact tests were performed to formally evaluate the association between twin type and dental RA. Across the entire dataset, RA rates failed to exceed 8% for any twin type. In monozygotic twins, deciduous mirroring totaled 5.3% of observed cases, while permanent mirroring totaled 7.8% of observed cases. We found no statistically significant association between RA and twin type for any morphological character (p‐value range: 0.07–1.00). Our results suggest the timing of monozygotic twin division does not explain the structure of asymmetry for our morphology dataset and that published estimates of identical twin mirroring rates may be inflated or contingent upon phenotype. Instead, rates reported for this sample more closely align with the proposed etiology of this condition.

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Nongenetic factors associated with human handedness and footedness in Japanese twin children

Abstract: It was concluded that factors that affect handedness or footedness in general, such as sex, birth year, age, parity, neonatal asphyxia, gestational age, birth complications, and family history, seem to have stronger effects on handedness and footedness than being a twin.

Cited by 18 publications

References 37 publications

Decreased prevalence of left-handedness among females with male co-twins: Evidence suggesting prenatal testosterone transfer in humans?

Decreased prevalence of left-handedness among females with male co-twins: Evidence suggesting prenatal testosterone transfer in humans?

Breast-feeding rates and related maternal and infants’ obstetric factors in Japanese twins

Mirror, mirror? An evaluation of identical twin mirroring in tooth crown morphology

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