Jason has schizophrenia. one of his symptoms is that he doesn't cry in sad situations or laugh in funny situations; he shows no emotion. this is known as:

The correct answer is flat affect.

Flat affect refers to a reduction or lack of emotional expression due to conditions such as schizophrenia or depression. Flat affect is characterized by a lack of facial expressions, indifference or apathy in emotionally arousing situations, speaking in a monotone and overall lack of emotional expression.