Some people with schizophrenia have almost no emotional response of any kind, a condition called affect.

The right answer is:  

Some people with schizophrenia have almost no emotional response of any kind, a condition called flat affect.  

Explanation:  

Particularly common during the onset of schizophrenia, flat affect is a symptom of the disorder. It is characterized by a lack of emotion or reaction, unchanged facial expression and an apathetic reaction to events that would require excitement, sadness, etc.