Can non-human animals suffer complex mental illnesses such as schizoaffective disorders? What 'mental architecture' is required to support such conditions? What about mentally-retarded humans? What kind of mental illnesses have they been known to suffer aside from their underlying mental debilities? How do their mental illnesses differ from those of people with normal IQs? What, if anything, does mental illness in animals and retards tell us about mental illness in non-retarded humans?