Which drug category includes substances that speed up brain activity?

Which drug category includes substances that speed up brain activity?

• A. Depressants
• B. Stimulants
• C. Hallucinogens
• D. Opioids

Answer: (B)

Speeding up brain activity means increasing the speed of mental and physical processes in the central nervous system. Substances in this category—stimulants—do this by boosting neurotransmitters like dopamine and norepinephrine, which raise arousal, energy, and focus. That’s why people feel more awake, talk faster, and move more quickly after using stimulants. Examples include caffeine, nicotine, and various amphetamines or cocaine. Because they amp up brain and body activity, stimulants can also raise heart rate and blood pressure, and they may cause insomnia, anxiety, or dependence. Other drug categories shift the balance in other ways: depressants slow down brain activity; opioids reduce pain and can depress respiration; hallucinogens alter perception and thought. The stimulant effects described here best capture the category that speeds up brain activity.

Speeding up brain activity means increasing the speed of mental and physical processes in the central nervous system. Substances in this category—stimulants—do this by boosting neurotransmitters like dopamine and norepinephrine, which raise arousal, energy, and focus. That’s why people feel more awake, talk faster, and move more quickly after using stimulants. Examples include caffeine, nicotine, and various amphetamines or cocaine. Because they amp up brain and body activity, stimulants can also raise heart rate and blood pressure, and they may cause insomnia, anxiety, or dependence.

Other drug categories shift the balance in other ways: depressants slow down brain activity; opioids reduce pain and can depress respiration; hallucinogens alter perception and thought. The stimulant effects described here best capture the category that speeds up brain activity.