Why do people talk faster when they are excited or nervous?

Excitement and anxiety both raise physiological arousal, which can affect how speech is produced. The mouth, breathing, and language areas of the brain may all move faster when a person is emotionally charged. That can make words come out quickly, sometimes with less clarity or more mistakes. Fast speech can also be social signaling, showing urgency, enthusiasm, or tension. Because speech is tightly linked to emotion, listeners often hear the emotion as well as the words.