Final answer:
Decreased motivation is a negative symptom of schizophrenia that should be documented by a nurse. Negative symptoms represent a decrease in normal functions, while positive symptoms indicate an excess or distortion of functions.
Step-by-step explanation:
The negative symptom of schizophrenia that should be documented by a nurse when assessing a client is B. Decreased motivation. Negative symptoms are those that involve a decrease in or loss of normal functions. Decreased motivation, or avolition, is the reduction in the desire or ability to start and sustain goal-directed activities, and is a hallmark negative symptom of schizophrenia. Other negative symptoms include flattened emotional state, loss of pleasure (anhedonia), and loss of basic drives. In contrast, flight of ideas, impaired memory, delusions of grandeur, and auditory hallucinations are considered positive symptoms as they represent an excess or distortion of normal functions.