The origins of left-handedness
Stone age implements discovered seem equally divided between
left and right.
Study of cave drawings indicates a preference for the left
When tools became more sophisticated, a clear hand preference
emerged (practicality of making two versions of a tool)
The right hand preference may have originated in sun worship. In
the Northern hemisphere you have to face south to follow the sun
and move from left to right until the suns sets in the west. This
gave moving to the right and the right hand side a great
Another theory says that as the heart is on the left hand side, a
shield would be in his hand to defend it. Any weapon therefore had
to be held in the right, which became the dominant hand.
Recent theories have included one that right is the normality and
left-handedness, is a deficiency which result from a traumatic
The brain is cross-wired the left hemisphere controls the right
handed side of the body and vice-versa .
The left hemisphere (RIGHT HAND CONTROL) controls the
following Speech, Language, Writing, Logic, Mathematics,
Science, this is the LINEAR THINKING MODE.
The right hemisphere (LEFT HAND CONTROL) controls the
following Music, Art, Creativity, Perception, Emotions, Genius,
this is the HOLISTIC THINKING MODE.
Whether there is a genetic reason for handedness is a
contentious subject. It certainly seems to be true that
left-handedness runs in families, although not in any predictable
way. Various researchers have looked at groups of families and
tried to work out the probabilities of left and right-handed parent
combinations having left-handed children, but they all come up with
The Left-handers Club have undertaken a survey that asks for
child and parent handedness and we have analysed that as well as
modelling the overall population under various assumptions to see
if population numbers and levels of left-handedness should stay
constant over time. Surprise, surprise, we have come up with more
We will be doing more research and analysis on this soon and
will publish an article setting out our findings. In the meantime,
the figures below should give a general guide...
About 1 in 10 people are left-handed.
Approximately 26% of children from two left-handed parents will
Only around 9% children from two right-handed parents will be
Where the parents have mixed handedness, the mother's handedness
will have most influence on that of the children, so a left-handed
mother and right-handed father should have more left-handed
children than the other way round.
Based on these same figures, nearly 75% of children of two
left-handed parents will still be RIGHT-handed.
To put it another way, only 2% of left-handed children will have
TWO LEFT-handed parents.
We hope that's all clear now!
According to the New England Journal of Medicine, mothers giving
birth later on in life are more likely to produce a left-handed
child. Mothers between the ages of 30 and 35 have a 25% higher
chance of producing a lefty