When people picture the human brain, the cerebrum is probably what most envision. The large mass splits into the right and left hemispheres that are joined by the corpus callosum, a bundle of nerve fibers that can transmit neural messages between the two halves. The right hemisphere controls the left side of the body, and the left hemisphere controls the right side of the body. Though there can be some overlap, each hemisphere does different things. In general, the left hemisphere is responsible for understanding and using language when we listen, speak, read, or write. The right hemisphere provides spatial awareness of surroundings and our physical positions within space. Both hemispheres play critical roles in different types of memory. The neuron-dense surface of the cerebrum is called the cortex.
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