What do narcotics do to the central nervous system?

Narcotics are substances that primarily act on the central nervous system by binding to specific receptors in the brain, leading to a range of effects. One of the most significant effects of narcotics is the depression of the brain's overall activity. This results in a decreased ability to react to stimuli, which can impair motor functions, judgment, and reaction times. This is particularly important for driving, as impaired reactions can lead to dangerous situations on the road.

The other choices suggest effects that are typically opposite to what narcotics do. They are not known for enhancing brain function or speeding up information processing; rather, they often slow down cognitive functioning. Additionally, while narcotics can impact the nervous system, they do not stimulate it—instead, they suppress certain brain functions, resulting in sedation or a sense of calm, but not in an active stimulation of the nerves. This information is crucial for understanding the risks associated with narcotic use, especially in contexts such as driving.