This article discusses central auditory processing disorders, and how the brain must function in order for processing to take place normally. The auditory system moves speech sounds along to the cortex of the brain, transporting information to the temporal lobe for organization of sounds into words, which are then sent to various centers of the brain dealing with thought, action, sight, etc. The following conditions must be in place. Nerve fibers must work together to transmit messages, all the transmissions must be transporting at the same speed, and the brain must produce the correct amount of chemical neurotransmitters for nerves to carry their messages. When nerve fibers have been damaged at birth by lack of oxygen, or there has been poor fetal development, they cannot transmit at normal speed, and the brain cannot produce proper amounts of chemical neurotransmitters in order for the nerves to carry their messages. Therapists can determine if students or workers have CAPDs by looking for certain behaviors. These types of behaviors could include ignoring a speaker while engrossed in something else, displaying unusual sensitivity to noise, difficulty in telling direction from which a parent is calling, tendency to confuse similar-sounding words, and confusing or forgetting directions given in one sentence.