The schizophrenia is a psychological illness caused due to the imbalance in the excitatory and inhibitory neurotransmitters in the brain. About 1% of the US population are suffering from schizophrenia. It is classified into two types:
1). Type I schizophrenia (characterized by positive symptoms such as behavioural excess and hallucinations)
2). Type 2 schizophrenia (characterized by negative symptoms such as deficit)
Thus, the blanks can be filled with positive; negative.