|a. the left hemisphere of the human brain, which is believed to control linear and analytical thinking, decision-making, and language|
|b. (as modifier): a left-brain activity|
left brain n.
The cerebral hemisphere to the left of the corpus callosum, controlling the right side of the body.
|left brain (lěft) Pronunciation Key
The cerebral hemisphere located on the left side of the corpus callosum. The left brain controls activities on the right side of the body, and in humans, usually controls speech and language functions. The thought processes of logic and calculation are generally associated with the left brain.