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Hand dominance and hand preference are terms that refer to a person’s consistent use of one hand rather than the other hand for a skilled task.
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The human brain is divided into two cerebral hemispheres that are specialised to perform different tasks (such as language and spatial reasoning*), and yet also work together when both sides are needed to produce the best results in physical and mental tasks.
Both hemispheres have an area called the motor cortex. When it comes to moving the body, the left motor cortex controls movements on the right side of the body, and the right motor cortex controls movements on the left side of the body.
Being able to use a tool with the same hand consistently and in a precise way (such as drawing with a pencil, using a screwdriver, cutting with scissors) can be an indication that the hemispheres of the brain have become specialised, or lateralised, for a specific function.
Children who don’t have a strongly specialised left or right hand for a specific task, who switch hands when a specialised hand is required, may struggle to carry out fine motor tasks that require automatic, learned movements, such as cutting neatly on a line with scissors, or handwriting.
The more a child uses a specific hand for a task, the more efficient the child becomes at that task, and then the movement becomes “automated”, which frees the brain up for other cognitive tasks.
Basically, that means that when your child can easily control a pencil with a consistently preferred hand, your child will be more able to write efficiently and effectively, and to pay more attention to thinking about what to write. Hand dominance matters!
The "non-dominant" hand has a very important role to play!
When the non-dominant hand moves in a coordinated way, the dominant hand is enabled to be far more accurate and more efficient during precision tasks.
Think about how the “other hand” holds and moves the paper during an intricate scissor cutting task, or how it holds a woodwork item with just the right degree of stability and at just the right angle while the “dominant hand” uses the tool. The non-dominant hand also works to stabilise the paper during handwriting, and to stabilise the ruler when drawing a line.
Essentially, both hands are working together, but one hand is specialising in precise tool use, and the other is specialising in assisting. The movements made by the assistant hand can actually be quite demanding and require good control, and they should not be disregarded as unimportant.
There are differing views on when hand dominance is established, but many experts agree that a consistent hand preference begins to emerge between ages 2 and 4 years, and that most children entering Kindergarten (age 5-6) have established a definite hand preference for using a pencil and scissors.
If your child is about to enter formal schooling (age 5-6) and has not yet developed a specialised hand for using a pencil and cutting with scissors, then I really recommend that you take your child to an occupational therapist, who can assess your child and help take the necessary steps as soon as possible.
Your child needs as much help as possible to help writing to become “automated” to enable learning to be fun and as stress-free as possible.
* Footnote: For example, in most people, the left hemisphere of the brain is specialized for language, while the right hemisphere is more specialised in visual-spatial skills.
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