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the claim

Left-handedness results from a person having absorbed a twin in the womb.

the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Left-handedness results from a person having absorbed a twin in the womb?

Unclear. Several sources note that the etiology of left-handedness remains unsettled and attribute it to factors such as perinatal injury, early brain injury, or hormonal imbalance, but none directly tests or addresses the specific claim that left-handedness results from absorbing a twin in the womb.

Verdict: PARTIAL LEAN · 0 sources for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence against · 4
Twins and handedness - Wikipedia
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Twins and handedness - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Twins_and_handedness

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More against · 3
[Left-handedness and health].
2010
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Milenković, S., Belojević, G., & Kocijancić, R. (2010). [Left-handedness and health].. doi.org. https://doi.org/10.2298/sarh1006387m

Left handedness in an identical twin discordant to his co-twin for handedness and schizophrenia, with neurological and psychometric evidence of left hemisphere damage
1990
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Weller, M. P. I. (1990). Left handedness in an identical twin discordant to his co-twin for handedness and schizophrenia, with neurological and psychometric evidence of left hemisphere damage. doi.org. https://doi.org/10.1136/pgmj.66.773.224

Pathological Left-Handedness: An Explanatory Model.
1972
Get citation
Paul, S. (1972). Pathological Left-Handedness: An Explanatory Model.. eric.ed.gov. https://eric.ed.gov/?id=ED063694

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