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Human Brain

The human brain has amazed and baffled people throughout the ages. Some scientists and doctors have devoted their entire lives to learning how the brain works. It is no wonder that people enjoy learning facts about this incredible organ in the human body. Many facts about the brain including how it works, how it develops, what it controls, how it affects sleep, dreams, and memory, and more, which are intriguing and exciting.

The human brain is the command center for the human nervous system. It receives input from the sensory organs and sends output to the muscles. The human brain has the same basic structure as other mammal brains, but is more "encephalized" — larger in relation to body size than any other brains.

The cerebral cortex is greatly enlarged in human brains, and is considered the seat of complex thought. The frontal lobes are associated with higher-level functions such as self-control, planning, logic and abstract thought. Visual processing takes place in the occipital lobe. The temporal lobe processes sound and language, and includes the hippocampus and amygdala, which play roles in memory and emotion, respectively. The parietal lobe integrates input from different senses and is important for spatial orientation and navigation.

The human brain is divided into two hemispheres, the left and right, connected by a structure called the corpus callosum. The hemispheres are strongly, though not entirely, symmetrical. The left brain controls all the muscles on the right-hand side of the body; and the right brain controls the left side. One hemisphere may be slightly dominant, as with left- or right-handedness.

The popular notions about "left brain" and "right brain" qualities are generalizations that are not well-supported by evidence. Still, there are some important differences between these areas. The left brain contains regions involved in speech and language. The left brain is also associated with mathematical calculation and fact retrieval. The right brain plays a role in visual and auditory processing, spatial skills and artistic ability, though these functions involve both hemispheres.


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