The theory of the two hemispheres of the human brain

MacLean coined the concept of the limbic system in and went on to place the limbic system into an evolutionary context. He proposed that the human brain is really three brains in one, a "triune brain. The Foundations of Human and Animal Emotions

The theory of the two hemispheres of the human brain

Scientific American July Evolutionary Origins of Your Right and Left Brain The division of labor by the two cerebral hemispheres—once thought to be uniquely human—predates us by half a billion years. Speech, right-handedness, facial recognition and the processing of spatial relations can be traced to brain asymmetries in early vertebrates By Peter F.

MacNeilageLesley J.

The theory of the two hemispheres of the human brain

RogersGiorgio Vallortigara The left hemisphere of the human brain controls language, arguably our greatest mental attribute. It also controls the remarkable dexterity of the human right hand.

Brain Lateralization

The right hemisphere is dominant in the control of, among other things, our sense of how objects interrelate in space. Forty years ago the broad scientific consensus held that, in addition to language, right-handedness and the specialization of just one side of the brain for processing spatial relations occur in humans alone.

Other animals, it was thought, have no hemispheric specializations of any kind. This is a preview. Make a selection below to access this issue.In psychology, the theory is based on the lateralization of brain function.

The brain contains two hemispheres that each performs a number of roles. The two sides of the brain communicate with one another via corpus callosum. In a sweeping two-year study, published in in the journal PLOS One, researchers looked at the brains of more than 1, people and found no evidence for significant differences in brain-side dominance among individuals.

From Genius to Madness

There are differences between the hemispheres though, right? Yes. The human brain is made up of a number of very complex parts that can be broadly divided into the left and right hemisphere.

To a casual observer these two hemispheres can seem identical, containing much the same sub-components.


Why is two-hemisphere brain favored in evolution? Update Cancel. ad by DigitalOcean. This is bilaterally symmetric, but is nowhere near being a brain with two hemispheres - it's just a bunch of connected nerve centers we call a brain out of convenience.

The above is based on a model of human mind I have developed. a condition in which the two hemispheres of the brain are isolated by cutting the connecting fibers (mainly those of the corpus callosum) between them Explain why psychologists are concerned with human biology, and describe the ill-fated phrenology theory.

There are two sides of your brain known as hemispheres. Your left hemisphere controls the right side of your body and deals with logical thought. Neuropsychologist Roger W.

The theory of the two hemispheres of the human brain

Sperry developed the right brain — left brain theory in He believed that the human brain is right or left side dominant and that each side of the brain controls.

Evolution formed the human brain in bursts of expansion - Paul MacLean's triune brain theory.