Final answer:
Anna's hearing of voices is a positive symptom of schizophrenia, specifically a hallucination, which involves experiencing sensations that are not present in reality.
Step-by-step explanation:
The positive symptom of schizophrenia represented by Anna's experiences is her hearing voices telling her that the TV is spying on her, which is a type of hallucination. Positive symptoms refer to the presence of psychotic behaviors not seen in healthy individuals. They can include hallucinations (such as hearing voices), delusions (false beliefs that are not based in reality), and thought disorders (unusual or dysfunctional ways of thinking).
Anna's lack of emotional response and remaining motionless may be considered negative symptoms, as they are the absence or diminishment of normal behaviors. However, the question specifically asks for the positive symptom, which is clearly the auditory hallucinations Anna is experiencing.
It's important to note that treatment for schizophrenia often involves antipsychotic medications, which can block dopamine receptors to reduce the severity of these symptoms, although they are not a cure and life-long medication may be necessary for management of the condition.