Researchers recently found that there is an area called thalamic pillow deep in the brain. It's like a receptionist for information. It is responsible for classifying and sorting out the information of external stimuli, and focuses people's attention on the most important information about behavior and survival. The researchers point out that the discovery is expected to lead to new treatments for disorders caused by lack of attention, such as attention deficit hyperactivity disorder, schizophrenia and so on.
Some schizophrenias are not caused by lack of attention is assumed by the above argument.