They propose that environmental factors in the womb (including exposure to hormones) may influence whether we favour the right or left hand later in life. Fetal development – some researchers believe that handedness has more of an environmental influence than genetic.This suggests to some researchers that the male hormone testosterone has an influence on right and left-handedness. Sex – slightly more boys than girls are left-handed.However, more recent research suggests it is more likely that lots of different genes ‘add up’ to produce a left-handed person. If a particular version of this gene is inherited, the child may be more likely to be left-handed, depending on reinforcement and other environmental influences. A single gene might be passed from parents to children to influence which hand a child favours. Genes – perhaps genetic factors predispose a child to favour the right hand.A straightforward genetic link hasn’t been proven, and it is possible for two right-handed parents to have a left-handed child. Just why one in 10 people favour their left hand is a mystery. While we know very little about what influences hand preference, we do know that handedness reflects the wiring of the individual brain. If your child is naturally left-handed, don’t try to force them into using their right hand. These days, left-handedness is more accepted. ![]() In the past, children who were naturally left-handed were encouraged or forced to use their right hand, mainly because of prejudice against the awkwardness of left-handed writing and the prevalence of ‘right-handed’ utensils. ![]() However, researchers still don’t understand why around 10 per cent of the population turn out to be left-handed. Whether a person favours their right hand or their left, and what this reveals about brain function, has been studied for at least 150 years.
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