How does alcohol affect reaction time?

• A. It increases reaction time
• B. It decreases reaction time
• C. It has no effect on reaction time
• D. It improves reaction time

Answer: (A)

Alcohol slows the brain’s processing and the messages between the brain and muscles, so you respond more slowly to signals. Reaction time is the interval between noticing something and making a response; alcohol makes that interval longer by dulling attention, slowing perception, and reducing motor speed. As blood alcohol concentration increases, the slowing becomes more pronounced, which is why driving or doing tasks that require quick responses becomes more dangerous after drinking. This is why the correct answer is that alcohol increases reaction time—not decreases or improves it. Even small amounts can cause some slowing, with greater impairment at higher levels.