Brain damage – a small percentage of researchers theorise that all human beings are meant to be right-handed, but some type of brain damage early in life causes left-handedness.However, this doesn’t explain why right-handed parents sometimes have left-handed children, and vice versa. Modelling – children learn to choose their right or left hand by copying parents and other significant caregivers.
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. The default entry for the days of the month is 30 and the default for the expired days is 1.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. Results are the number of days remaining in the month, the percentage of days expired and the percentage of days remaining. Valid entries for expired days are from 0 to the number of days entered for the month. Valid entries for days in the month are only 28, 29, 30 and 31. To determine the expired days percentage, divide the expired days of the month by the days in the month. By definition, percentage is a fraction or ratio expressed as part of 100. If you need information on percent change per capita, use our Percentage Change Per Capita Calculator. If you need to give the percentage change from one number value to another, try our Percentage Change Calculator. If you need to obtain the percentage of hours of the day, try our Hours In The Day Percentage Calculator. This data is often used in business and financial calculations and projections. This calculator is designed to give the percentage of the expired and remaining days in a month. This calculator requires the use of Javascript enabled and capable browsers.
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