Final answer:
A person demonstrating slowed speech or movement is showing signs of a depressed central nervous system, likely due to the use of CNS depressants like alcohol, which impair motor function and cognition.
Step-by-step explanation:
A person who is talking or moving slowly is demonstrating a sign of a depressed central nervous system. This condition is often associated with the use of central nervous system depressants, such as alcohol, which can lead to symptoms such as impaired motor and sensory function and reduced levels of arousal. These substances lower neurotransmission levels, causing relaxation, sedation, or decreased alertness. As dosage increases, a person may experience more severe effects such as impaired cognition, slurred speech, poor coordination, and in extreme cases, respiratory depression, coma, or death.