y percent.
             Little is known about the Environmental Theory. The theory is built mainly on the effects of stress on human behavior. Most researchers agree that stress alone cannot be the main cause of schizophrenia. Most researchers agree that stress could possibly trigger or worsen the symptoms when the illness is already present. Other researchers focus on drug abuse, like stress, certain drugs such as amphetamines can make psychotic symptoms worse if a person already has schizophrenia. Furthermore, these drugs can, in a sense, create schizophrenia. Other researchers that support the Environmental Theory believe that "slow viruses" may be to blame. Slow viruses are viral infections that go undetected for long periods of time. Signs and symptoms are delayed and may occur many years after the first infection.
             The Bio-Chemical Theory suggests that schizophrenia is caused by mixed up signals in the brain. When something acts upon one of our senses, electrical impulses are sent to the brain. These impulses allow us to feel
             ...