Handedness in Two Generations

Tan, Lesley E.

doi:10.2466/pms.1983.56.3.867

Cited by 23 publications

(23 citation statements)

References 13 publications

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“…Stellman et al showed a high association of left handedness with disease and disease risk factors [21]. The study of Ashton [22] Coren and Halpern [23], Fleminger et al [24], Kuhlemier [25], Lalumiere et al [26], Lansky [27]; Porac et al [28] and Tan, have revealed shortened life span in left handed individuals compared to right handed individuals [29]. Investigations of Binali et al displayed that caries experience in left handed individuals have lower incidence than right handed individuals [30].…”

Section: Discussionmentioning

confidence: 99%

The study of radiosensitivity in left handed compared to right handed healthy women

et al. 2012

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BackgroundRadiosensitivity is an inheriting trait that mainly depends on genetic factors. it is well known in similar dose of ionizing radiation and identical biological characteristics 9–10 percent of normal population have higher radiation response. Some reports indicate that distribution of breast cancer, immune diseases including autoimmune diseases as example lupus, Myasthenia Gravies and even the rate of allergy are more frequent in left handed individuals compared to right handed individuals. The main goal of the present study is determination of radiosensitivity in left handed compared to right handed in healthy women by cytokinesis blocked micronuclei [CBMN] assay.5 ml peripheral fresh blood sample was taken from 100 healthy women including 60 right handed and 40 left handed. The age of participants was between 20–25 old years and they had been matched by sex. After blood sampling, blood samples were divided to 2 groups including irradiated and non-irradiated lymphocytes that irradiated lymphocytes were exposed to 2 Gy CO-60 Gama rays source then chromosomal aberrations was analyzed by CBMN [Cytokinesis Blocked Micronuclei Assay].ResultsOur results have shown radiosensitivity index [RI] in left-handers compared to right-handers is higher. Furthermore, the mean MN frequency is elevated in irradiated lymphocytes of left-handers in comparison with right-handers.ConclusionOur results from CBMN assay have shown radiosensitivity in the left handed is higher than right handed women but more attempts need to prove this hypothesis.

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Section: Discussionmentioning

confidence: 99%

The study of radiosensitivity in left handed compared to right handed healthy women

et al. 2012

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“…(Liederman, J. & Healey, J. M., 1986;Tan, L. E., 1983)). Other studies assessed the handedness only of a specialised group such as musicians (Oldfield, R. C., 1969;Byrne, B., 1974), without the inclusion of a control group.…”

Section: Reasons For Rejection Of Studiesmentioning

confidence: 99%

“…Writing hand R-L -9.3 10.4 8.1 Tan andNettleton, 1980 (Tan, L. E. &Nettleton, N. C., 1980) 942 Australian students and children Random sample 2 -Written questionnair e…”

Section: %mentioning

confidence: 99%

The incidence of left-handedness: a meta-analysis [1993]

McManus¹

2019

Preprint

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A meta-analysis is reported of 88 studies, examining 100 study populations, in which the handedness of 284665 individuals has been assessed. The overall incidence of left-handedness was 7.78%. The incidence of left-handedness was not related to the method of measurement, or the length or number of response items included in inventories. Study populations with lower response rates and smaller study populations showed some evidence of higher incidences of left-handedness, presumably due to response biasses. There was no evidence that the incidence of left-handedness was related to the year of publication of studies; however the incidence of left-handedness was lower in older subjects and in those from earlier birth cohorts, the two effects not being statistically distinguishable.Information was available from 64 study populations concerning the incidence of left-handedness in males and females; overall 8.52% of males were left-handed compared with 6.69% of females, the male incidence being 27.4% higher than that in females. Although there was some suggestion that the sex difference was greater in larger studies, and in studies whose main purpose was not the study of handedness, these differences were not significant. It is concluded that the size of the sex difference is unrelated to any of the moderator variables we have studied.It was not possible to carry out a meta-analysis of degree of handedness due to wide-spread differences in the method of reporting of degree of handedness.We recommend that future studies of handedness should, as a minimum, use one of three standard methods of assessment, so that comparison of studies is facilitated. Note: This manuscript was originally prepared in 1993 but due to problems at a major journal, described briefly, was never eventually published. It has however been cited on a number of occasions, and has been available at https://www.ucl.ac.uk/medical-education/publications/unpublished-manuscripts/meta-analysis-of-handedness . A major meta-analysis of handedness in 2019 by another author has now been submitted which cites this manuscript, and therefore it needs to be available in a more archivable format.

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“…Switched left-handers were disproportionately represented among older compared to younger decedents, indicating an historical reduction of sanctions against left-handed writing. These results contradict the survival advantage for right-handers reported by Coren and Halpern (1991), providing evidence more favourable to a cultural conditioning explanation, rather than one emphasising selective mortality.Data from family studies of handedness consistently reveal a lower incidence of left-handedness in the parental than in the offspring generation (Annett, 1985;McManus & Bryden, 1992;Tan, 1983). In addition, most large-scale surveys of handedness distributions across the life-span have reported a systematic decline in left-handedness with increasing age, to such an extent that few sinistrals were located in the older (age > 70) cohorts (Brito, Brito…”

mentioning

confidence: 95%

“…Data from family studies of handedness consistently reveal a lower incidence of left-handedness in the parental than in the offspring generation (Annett, 1985;McManus & Bryden, 1992;Tan, 1983). In addition, most large-scale surveys of handedness distributions across the life-span have reported a systematic decline in left-handedness with increasing age, to such an extent that few sinistrals were located in the older (age > 70) cohorts (Brito, Brito…”

mentioning

confidence: 95%

Mean mortality among Brazilian left- and right-handers: Modification or selective elimination?

Martin¹,

Freitas²

2002

Laterality: Asymmetries of Body, Brain and Cognition

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Many surveys report a higher incidence of left-handedness in younger than in older cohorts, and explanations for this phenomenon have centred around two rival hypotheses. The modification hypothesis attributes this trend to secular differences in the social tolerance of left-handed preferences, whereas the elimination hypothesis contends that left-handers have a shorter life-span than right-handers do, and hence are infrequent in the population above age 70. In order to evaluate these two hypotheses, data were collected on 513 decedents from kin informants. There were 465 right- and 48 left-handed decedents, including 18 switched sinistrals. Females lived significantly longer than males, and there was a nonsignficant survival advantage for left-handers. Switched left-handers were disproportionately represented among older compared to younger decedents, indicating an historical reduction of sanctions against left-handed writing. These results contradict the survival advantage for right-handers reported by Coren and Halpern (1991), providing evidence more favourable to a cultural conditioning explanation, rather than one emphasising selective mortality.

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Handedness in Two Generations

Cited by 23 publications

References 13 publications

The study of radiosensitivity in left handed compared to right handed healthy women

The study of radiosensitivity in left handed compared to right handed healthy women

The incidence of left-handedness: a meta-analysis [1993]

Mean mortality among Brazilian left- and right-handers: Modification or selective elimination?

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