echolalia

sanojen matkiminen

kaikuhoku puhekieltä The immediate, involuntary, and repetitive echoing of words or phrases spoken by another.
An infant's repetitive imitation of vocal sounds spoken by another person, occurring naturally during childhood development.
Any apparently meaningless, repetitious noises, especially voices.
1926, (w), The Great Gatsby, Penguin 2000, p. 50:

There was the boom of a bass drum, and the voice of the orchestra leader rang out suddenly above the echolalia of the garden.