Final answer:
Anhedonia is a negative symptom in psychology characterized by the inability to feel pleasure or enjoyment in activities that were previously enjoyable.
Step-by-step explanation:
Anhedonia is a negative symptom in psychology. Negative symptoms in psychology refer to the absence or reduction of normal emotions or behaviors, as opposed to positive symptoms which refer to the presence of abnormal behaviors or experiences. Anhedonia is specifically a symptom characterized by the inability to feel pleasure or enjoyment in activities that were previously enjoyable.