The brain is not symmetrical. The left and right hemispheres may be different in size, shape, or function. The two hemispheres are connected by a bundle of nerve fibers called the corpus callosum.
Some people have a condition called split-brain, which is when the corpus callosum is severed. This can be done surgically to treat certain conditions like epilepsy. People with split-brain can often function normally, but they may have some unusual abilities, like being able to write with one hand and draw with the other.
The hemispheres are not always equal in size. The left hemisphere is generally larger in right-handed people, while the right hemisphere is larger in left-handed people. This difference is thought to be due to handedness.
The hemispheres are also not always equal in function. The left hemisphere is generally better at language and logical tasks, while the right hemisphere is better at spatial tasks and visual tasks.
Some tasks, like reading, use both hemispheres of the brain. However, most people have a dominant hemisphere, which is the one that is used more for that particular task.
The hemispheres are not equal, but they are both important for different tasks. The brain is a complex organ, and scientists are still learning about all of its functions.
Though the human brain appears symmetrical, the left and right hemispheres are not equal. The hemispheres are connected by the corpus callosum, a bundle of nerve fibers that allows for communication between the two sides.
The left hemisphere is responsible for language and speech. It is also the side that is usually dominant in right-handed people. The right hemisphere controls the muscles on the left side of the body and is responsible for spatial perception and visuo-constructive abilities. It is usually dominant in left-handed people.
The two hemispheres are not exactly alike, but they are similar enough that if one side is damaged, the other side can often take over some of its functions. However, because the hemispheres are not perfectly equal, some functions are lost when one side is damaged.
The brain is an amazing organ, and the fact that the hemispheres are not perfectly equal only adds to its mystery.