One of the negative symptoms of schizophrenia is uncontrollable outbursts of rage. an expressionless face. loud and meaningless talking. inappropriate laughter.

A negative symptom of schizophrenia is an expressionless face.

Negative symptoms when it comes to psychological or mental disorders refers to symptoms that are absent or diminished once a person develops a condition such as schizophrenia. If a person showed a full range of facial expressions - smiling, laughter, anger, fear and pain - before they were diagnosed with schizophrenia, and then turned expressionless after being diagnosed with schizophrenia, it is a negative symptoms (absence or removal of a previous behavior or phenomenon).