What people see through their eyes is accumulated and then reassembled in the brain. Sometimes, the brain can cause the eye to see things that do not actually exist. This disconnect between what a person sees and what is physically present is called an optical illusion Repeated exposure to patterns or brightness can create irregular images. Sometimes , medical conditions can cause the brain to misinterpret incoming information attained through the eyes. Simply staring at an object for a long period of time can deceive the brain as well. Do It! The brain determines __ A immunity B aggression C maturity D perception