Actually, schizophrenia is maladaptive, not adaptive. Adaptive outcomes have benefits.I was unclear, *intelligence* is the adaptive benefit for the majority of people with the genes. For a few people that get an unfortunate combination of recessive traits, they become schizophrenic. On the whole the increased intelligence is a greater overall benefit, meaning that the genes for schizophrenia hang around in population.
Okay, that makes more sense.