The disordered thinking of schizophrenia invariably reflects the cultural biases of the individual. Pruning, if that is a cause, must affect the filter that allows most of us to reject the thousand crazy ideas that pop into our heads each day, while permitting the few reasonable ones.<p>This may be why there is an environmental component. If a potential schizophrenic with an overly-pruned filter is exposed to the idea that a magical god came to earth and sacrificed himself to give us eternal life, and if that idea is presented culturally as real, it may be impossible for the schizophrenic to filter that and place it in the DMZ of fantastical-but-culturally-prevalent notions that the rest of us use.<p>Imagine how disordered one&#x27;s thinking might become if we had no ability to interpret the spew with &quot;a grain of salt&quot;.