Alcohol's immediate effect on the brain is most unusual. The simple molecular structure of alcohol allows it to penetrate this selective screen and gain easy access to the brain and its extension, the spinal cord. Consequently, alcohol has immediate and profound effects on behavior. In high doses, alcohol is an anesthetic that acts as a depressant on the central nervous system. One experiences a slowed reaction time and poor muscle control.
Judgment is impaired and as drinking continues, decision making is affected.
Three drinks affect the ability to think and reason, and memory as well. One experiences reduced self-restraint and lessened inhibitions. As the alcohol depresses your control systems, visible signs of intoxication appear. Slurred speech and an unsteady gate become noticeable. Four drinks blurs the vision.