Up to 25% of people may suffer from crossed laterality. This condition is caused by miscommunication between the left and right hemispheres of the brain, and has been linked to a number of learning disabilities in children.
What is crossed laterality?
Brain functions are typically distributed between both hemispheres (left and right), and this is referred to as “laterality”. People typically develop a dominant side, so for example, right-handed people will also favour their right eye, ear and foot, whereas left-handed people will also favour their left eye, ear and foot. This is often called “homogeneous laterality”.
Crossed laterality occurs when a person doesn’t uniformly favour the same side of the body. It is also referred to as “confused laterality”, “mixed preference”, “mixed hand-eye” or “mixed dominance”.
It is thought that the cause of crossed laterality is miscommunication between the left and right hemispheres of the brain. Many studies have suggested that people with crossed laterality are at special risk of suffering academic difficulties, most notably with reading and writing.
How do I know if my child has cross laterality?
Common symptoms include:
- Difficulty with reading, writing and arithmetic skills.
- Problems with spatial and temporal organisation.
- Difficulty in spelling encoded information.
- Low psychomotor competence.
- Difficulty interpreting the direction of spelling.
- Difficulty concentrating.
A laterality test is first conducted to determine which neuromuscular groups are affected. If, for example, the greatest number of these groups (arm, hand, eye, ear, foot) favour the left, then the aim will be to make the person uniformly left-sided.
Because the root cause of this disorder involves miscommunicating neurophysiological pathways, the solution is to stimulate and establish better connections so that the correct cerebral lobe may control the correct laterality. Success rate of these therapies is close to 100%.