O.p. Agarwal Chemistry

Why is our right brain thinks differently than the left side

Even in the early vertebrates, a division of labor was worth the end brain

From: Scientific American, July 2010

left sitting in the brain's language and analytical thinking. The right hemisphere of our cerebrum is responsible for detecting the room, even for artistic design. Even for many left-handers appear to apply this division of labor.
neuroscientists and behavioral physiologists realized only slowly that represent the differences between the two sides of the brain not exclusively human phenomenon. It was not until as early humans acquired language. Right-and left-handed - or rather right and left types - there are in vertebrates appear continuously, to the fish. And surprisingly, dominated by various animal species as ours in the majority of individuals the right side of the body - that is, extend the left brain side, because the nerves cross.

Three scientists say in the July issue of "Scientific American" of the evolution of the brain's two sides: the psychologist Peter F. MacNeilage from the University of Texas, the neuroscientist Lesley J. Rogers of the University of New England in Australia and Giogio Vallortigara from the University of Trento in Italy. They have examined, for example, that chicks learn it very well, while preserving a hawk and to find food grains between small bright pebble. But if you chicken eggs until hatching in the dark holds succeed, the chicks not both. The explanation: The two cerebral hemispheres develop then no longer different, because the eye receives the top of the egg lying no light. Obviously such a chick is overwhelmed when it should do two things at once. However, it has two different brain sites that share the tasks, so it has no problems.

Other vertebrates such as toads register of confusion with the right brain controls the left and eat. Grab about an insect or worm until the prey appears to the right in their view. An Enemy of the right they do not care about it. Only when the snake from the left, they go away.

This distinction seems to have occurred early in vertebrate evolution. The left side of the brain explain MacNeilage and his co-authors, was originally responsible for everyday life and routine behavior have been around for food. The right, however devoted to unexpected events and sudden appearance of danger. While the left hemisphere paid attention to detail, evaluated the right of the big picture. The environment looks like from every position is different. To still recognize the environment, we must assess overall aspects. Why should deal with this side of the spatial perception.

also recognize individual faces in our brain the right side. In other mammals and birds is the same. In a social encounter, it is often important to quickly grasp who you have in front of - and thus to make the surprise. Looking at the tasks of the two cerebral hemispheres from the evolutionary perspective, it is not surprising once again that right-handed react faster to unexpected events with the left hand.

And why sits next to the Language Centre? MacNeilage thought, speech started with smacking sounds and chewing movements. The accompanying noise during regular opening and closing the mouth became meaningless syllables containing Vowel and consonant, like "mama". The pronounced right-handedness in many people they lead to the fact that their food more sophisticated primates studied. The most direct link from the left side of the brain that controls the feeding runs, even now at the right hand.