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Hemispheric-neuroplasticity Relationship


How does neuroplasticity relate to hemispheric dominance and lateralism?
Why are some people
dominant in one hemisphere than the other?
Although new findings are gradually sweeping away the concept of hemispheric dominance but for academic reasons and for the purpose of understanding, it is no doubt that this concept continues to linger even in the lay man world.

So it has become a popular topic to rashly conclude on someone's mental competence. Anyway, with no disregard at all for the concept of hemispheric dominance, it is therefore necessary to answer the above questions about lateralism and dominance of the human brain. 

The answer is simply, 'the neurons that fire together, wire together and the neurons that fire apart, wire apart' (Hebb, 1949). Take for instance, creative people in art and music are better predicted to have much synaptic connection in their right brain hemisphere especially if they are right-handed people. I would say, "Leonardo Da Vinci, pictorial stimuli made your genius". Da Vinci was ambidextrous (both right-handed and left-handed at the same time). This could possibly have resulted from strong synaptic connections in both hemispheres of his brain therefore making it crystal-clear that the Hebbian principle is correct. Although no brain imaging technique was used on his brain, this law has offered us a wide range of discretion about what possible neurological factors are responsible for his creativity most notably Mona Lisa and the Last supper.


Donald Hebb was a Canadian physiologist in the 19th century. His principle of neuroplasticity is widely accepted to have now become the law of neuroplasticity. The dedicated work of Hebb has long been done even before the invention of a machine that can image the brain functions. During his time, he only made use of Maizes and rats to conduct his crude but vast research. 

He compared the ability of experimental rats and controlled rats to run through a maize with respect to the time it will take them to do so. The result was astonishing! Rats raise in a filthy environment performed poorly on the task while the rats raised in an enriching environment like light, music and clean environment scored high on the task. To this observation, Hebb laid down his principle.

Photo credits:  learningbreakthrough.com

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