Final answer:
Chronic apathy and lack of interest in activities is a symptom commonly associated with both hysteria and schizophrenia. These 'negative' symptoms are part of the symptomatology of schizophrenia and can be seen in hysteria as well. Treatment for schizophrenia often includes medications that address these symptoms.
Step-by-step explanation:
Both hysteria and schizophrenia can manifest with a variety of symptoms, but the symptom that is commonly associated with both conditions is Chronic apathy and lack of interest in activities. Schizophrenia is characterized by its 'negative' symptoms such as emotional flatness, loss of pleasure, and loss of motivation. These symptoms are similar to the effects witnessed in hysteria, where there is a pronounced disengagement from usual activities and a general lack of interest.
Such symptoms are often seen during the progression of schizophrenia and can also be observed after significant emotional events that can trigger hysteria. Treatments for schizophrenia may include antipsychotic medications which help to stabilize mood and reduce the severity of both positive symptoms (such as delusions and hallucinations) and negative symptoms (like apathy and withdrawal), helping patients to regain interest in daily activities to some extent.