Final answer:
The symptoms associated with the catatonic specifier in brief psychotic disorder are stupor, muscle rigidity, and negativism.
Step-by-step explanation:
The symptoms associated with the catatonic specifier in brief psychotic disorder are stupor, muscle rigidity, and negativism. The client may exhibit a decrease in movement, a fixed or rigid posture, and a resistance to instructions or requests. These symptoms can significantly impair the individual's ability to function and may require hospitalization.