Now the method used is schizophrenic: we solve the problem which already occured, with the hope that it won't reoccur in the future. This method is unable to predict what other long-range problems might occur after the change operated. Its only advantage is that is gives a personal assurance (including legally) to the peson who initiated the solution. The theory shows the existence of a basic dilemma connected to the problem described above: optimisation or capacity to face an aggressive environment. The tendency of induced schizophrenia occurs in an optimised structure with slow changes. The individuals have optimal reactions as long as the environment is stable. At a change of the environment, they have a reduced capacity to become compatible with the changed environment. In a new environment, the favorised are the aggressive ones, as they have the capacity to build and operate their own long-range models. We continue with the induced schizophrenia (XS1B). When one of these life styles is followed for a long time, the person is going to be affected by schizophrenia induced by the environment, which in time can become pathological. This negative phenomenon can be attenuated to a certain extent, because of the permanent changes in society. These changes are forcing the population in advanced countries to come up with new models every day. Even though society forces people to build and operate new models every day, some do not have the capability to do this. Because evolution is based on symbolic models, some people may not be able to build symbolic models of good quality. Thus, there might be a group of people that cannot fit anymore in the society, might isolate themselves or even oppose to the society. This way, induced schizophrenia (XS1B) might build shielding models, which could act against society. If this group gains enough power, it could try to destabilize the society. Schizophrenia can appear in an unlimited number of types, depending on the perturbations, which are associated with the fundamental process of the brain operation. The affected functions are: - The construction of new models and the continuous improvement in accordance with the changing external reality. - The integration of a new model in the structure of models of the brain. The long-range models must contain enough short-range models to handle the external reality, which is complex and changing. Based on the above considerations, the normal definition of schizophrenia will be given: Schizophrenia is a technological problem of the brain. The brain cannot build complex models that fit the external reality, and integrate them in a harmonic/logic way in its general structure of models. The function of building and operating short-range models is maintained. Many times, schizophrenics on the first level (XS1) can be brilliant in the construction of short-range models. In short, for humans, schizophrenia is short-range thinking.