TS Live: Handy Apes

Studying handedness in chimps may shed light on the mysterious trait in humans.

By | September 1, 2014

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Avatar of: dfurtek

dfurtek

Posts: 2

September 4, 2014

On my father's side, there are only two lefties and only two baldies - me and my Uncle Leftie. That appears to coincidential to me.

Avatar of: insi10

insi10

Posts: 2

Replied to a comment from dfurtek made on September 4, 2014

September 5, 2014

In my family, they're all right-handed and as age advances, they're turning to right-wing politics, except for the one lefty, both handed and politically, me.

Avatar of: Andries

Andries

Posts: 14

September 17, 2014

STOP DIGGING IN THE BACKSIDES OF APES AND YOU MIGHT FIND REALITY

Avatar of: S Churchill

S Churchill

Posts: 10

September 30, 2014

Handedness preference may be confired by imprinting - and that maternally-determined methylation status during pregnancy may influence the strength of the assymetry (lateralization).  Socialization may also affect the expression of handedness after birth, especially during development of fine motor skills such as grasping and standing.  We suggest that gait (dominant side) is an easy metric for the strength of the lateralization tendency in many animal, including humans.

Supporting the role of epigenetics in dominant-side preference, see, for instance, a paper discussing the relationship between methylation of CpG islands, LRRTM1 exporession, schizotype and handedness (May 2014)

http://www.nature.com/jhg/journal/v59/n6/full/jhg201430a.html

Furthermore, we extrapolate brain connection plasticity with methylation pool status and skewness for familial handed preference with nutritional status.

For evidential support, see:

https://www.ucl.ac.uk/medical-education/publications/reprints2009/2009-History_GeographyOfHumanHandedness.pdf

Note the regained handed preferencess skewness (from recent evolutionary ratio of 90:10) during the Modern Industrialization era, at the beginning of the 20th century (Fig 3.1), after the loss in the Victorian era.  The article points (and supports) are contention that rigid socialization may have forced many lefthanded individuals to pseudo-dominant sidedness. 

A deeper understanding of other important factors underlying the loss of lateralization/handedness during the Victorian era is, at this time, proprietary.

CpG island methylation, a sign of poor methylation pool status, is also related to alopecia.  Extreme neural plasticity is also related to schizotype, expressiveness, and creativity.

 

 

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