Final answer:
The typical symptoms of caffeine intoxication are anxiety, restlessness, and insomnia, along with muscle twitching, nausea, and irregular heartbeat due to caffeine's action as a central nervous system stimulant.
Step-by-step explanation:
The typical symptoms of caffeine intoxication include anxiety, restlessness, insomnia, agitation, muscle twitching, nausea, irregular heartbeat, and in severe cases, even death. Caffeine acts as a central nervous system stimulant and is the most widely consumed psychoactive drug in the world. It blocks the action of adenosine, a brain chemical that promotes sleep, and affects other signaling molecules, leading to increased alertness and delayed fatigue. However, when consumed in high amounts, it can lead to adverse effects that vary in sensitivity among different individuals.