Primary auditory cortex (PAC)

This is the region of the brain that is responsible for the processing of auditory (sound) information. Corresponding roughly with Brodmann areas 41 and 42, it is located on the temporal lobe, and performs the basics of hearing—pitch and volume. Besides receiving input from the ear and lower centers of the brain, the primary auditory cortex also transmits signals back to these areas. [Source: Wikipedia]