Palilalia is a disorder that causes a person to speak very rapidly, repeating words over and over again. Sometimes palilalia can be a symptom of Alzheimer's disease.
The speech condition known as palilalia can sound at first like a stutter — it causes a speaker to involuntarily repeat words, syllables, or even whole phrases. It's also similar to echolalia, a disorder in which a speaker repeats other people's words. But while echolalia tends to make no logical sense, palilalia is correct speech that's repeated automatically. The Greek roots of palilalia are pálin, "again," and laliá, "to speak."