Schizophrenia

Schizophrenia is a mental disorder marked by the loss of contact with reality. When a person's thinking, feeling, and behavior is so far from normal as to interfere with his or her ability to function in everyday life, and delusions, hallucinations, irregular thinking or emotions are produced, then he or she has a mental illness called schizophrenia. About one hundred years ago schizophrenia was first recognized as a mental disorder and researchers have been searching for a cure since. The exact cause of schizophrenia is still unknown and scientists are certain that schizophrenia has more than one cause. Scientists have developed dozens of theories to explain what causes this disease, but researchers are focusing on four leading theories. They are the Genetic Theory, the Environmental Theory, the Biochemical Theory, and the Bio-Psycho-Social Theory. The Genetic Theory argues that schizophrenia is caused by traits in a person's genetic makeup. As we all know, a person has twenty-three pairs of chromosomes. Each pair contains one chromosome from each parent. In corresponding locations, called loci, of each chromosome the genes for specific traits are located. Some researchers believe that problems with these genes can cause schizophrenia. We inherit our genes from our parents but this does not mean that the parents of a schizophrenic are mentally ill. Problems in a persons genetic make up could come from mutated chromosomes or recessive genes. In an attempt to prove this theory scientists study identical twins. Due to the fact that identical twins have the exact same genetic make up researchers will be able to determine if heredity is the main cause of schizophrenia. However, evidence seems to disprove this theory. This is because on some occasions both identical twins are schizophrenics and other times only one is inflicted. To defend the theory, it should be noted that this research is difficult and complicated. Identical twins are relatively rare, especially twins who are both diagnosed with schizophrenia. Further defending the theory, studies have shown that children with one parent diagnosed with schizophrenia have a ten percent chance of suffering from schizophrenia. When both parents are schizophrenic their risk raises to about forty percent. Very little is known about the Environmental Theory. It is built mainly on the effects stress has on human behavior, however, most researchers agree that stress alone cannot be the main cause of schizophrenia. Most researchers agree that stress can 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 create schizophrenia - like symptoms in normal persons when the dosage is large. 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 therefore 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 to the brain. When something acts upon one of our senses, electrical impulses are sent to the brain. These impulses allow us to feel pain, smell, and they also manage our thought processes. In our body we have a complex nerve system. For example, there is no one single nerve that travels from our feet to our brain. Therefore, in order for information to be sent to the brain the nerves must interact with each other. Because the system is so complex it is possible for the signal to get mixed up. When this happens our brain may misinterpret the signal or may not receive it at all. If the signal does get mixed up on the way to the brain the make up of the impulse can undergo a chemical change resulting in abnormal thought processes and abnormal behavior. For example, scientists have in-depth studies on a chemical in the brain called dopamine. They believe that schizophrenics have higher levels of this chemical than a mentally sound person. To experiment, researchers have injected animals and humans with amphetamines, this increases the amount of dopamine reaching the brain. Following the injection, the animals exhibit the same behavior as humans who have been diagnosed with schizophrenia, such as standing still for long periods of time or continuously pacing. In humans, research has shown that when given small doses of amphetamines the amount of dopamine in the brain slightly increases. Although the increase is small it still causes delusions and hallucinations. In conclusion, researchers believe that an increased amount of dopamine to the brain causes abnormal behavior, however, they cannot safely say that this is the sole cause of schizophrenia. The Bio-Psycho-Social Theory combines all of the previous theories. Some researchers believe