1 2 3 4 NIMH 2009, What are the symptoms of schizophrenia? § Positive symptoms. ↑ NIMH 2009, What are the symptoms of schizophrenia? § Negative symptoms. ↑ NIMH 2009, What are the symptoms of schizophrenia? § Cognitive symptoms. 1 2 NIMH 2009, What about substance abuse?. 1 2 3 4 Watson, David R.; Anderson, Julie M.E.; Bai, Feng; Barrett, Suzanne L.; McGinnity, T. Martin; Mulholland, Ciaran C.; Rushe, Teresa M.; Cooper, Stephen J. (1 February 2012).