Most people have one side of their body that’s stronger than the other. For example, if you’re right-handed, you probably do everything with your right hand – brush your teeth, comb your hair, write, eat, etc. That also means that, most likely, you have stronger sight in your right eye, stronger hearing in your right ear, and put your right foot into your trousers first. Why is that so?
As a child develops and interacts with her world, her brain slowly works through a configuration called lateralization, where one side of the brain takes charge, i.e. becomes the dominant side, while the other side becomes the supporting region.
Mostly, the left side of the brain takes control. That’s why most people are right-handed, because one side of the brain controls the opposite side of the body.
Are you wondering how to determine your child’s dominance?
It’s easy.
- For eye dominance, give your child the inner tube from a roll of paper towel or toilet tissue and ask her to pretend it’s a telescope and look through it. Note the eye she puts it to…that’s her dominant eye.
- To check for foot dominance, have your child kick a ball and notice which foot she uses.
- To find out ear dominance, give your child a telephone and ask her to pretend to call a friend. Observe the ear she holds it up to. That’s her dominant ear.
- For most children, the dominant hand will be the hand they write with. But that isn’t always the case. Many children have been taught to write with their right hands because it’s the norm, without any thought of the child’s preferred hand. To confirm your child’s dominant hand, hand her an object with both of your hands. Take note of which hand she uses to accept it.
Those people who do not have that unilateral dominance are said to have mixed dominance, which is also known as cross dominance or crossed laterality. They prefer to do different activities with different sides of their body. For example, write with the right hand and eat with the left hand. This mixed dominance may cause the brain to be disorganized.
It has been said that people whose hand, eye, foot, or ear dominances are not consistently either right- or left-sided are at risk of experiencing academic difficulties.
This idea that there is a correlation between academic performance and mixed dominance has been gaining popularity, so in 2017, a group of researchers conducted a study to determine the impact of crossed laterality on academic achievement and intelligence. They did a systematic review and meta-analysis of the articles published on the topic, since 1900. They did not find strong evidence in favor of a relationship between crossed laterality and academic achievement.
Although these researchers found that mixed dominance does not cause learning disabilities, others have found that mixed dominance appears more often in children with dyslexia.
If your child is mixed dominant, there is no need to “fix” her dominance. Instead, focus on recognizing your child’s strengths, and engage her in brain lateralization exercises frequently, to ensure that her limbs cross the midline of her body.
Notwithstanding everything I’ve said here, remember that research has definitively shown that the brain can change.
If you don’t know your eye dominance, here is one way to find out:
- Extend your arm out in front of you and place your thumb over a distant object, for example, a light switch.
- Now close each eye, one at a time. Your thumb may seem to move depending on which eye is open. If your thumb remains over the object when one eye is open, this is your dominant eye.
Are you right or left eye dominant?