A speech disorder where a person involuntarily says different words than those they intend to speak.
From Greek hetero- (different) + lalia (speech/talking), combining to describe misaligned speech output. This rare neurological condition was named in the 19th century to distinguish it from other speech disorders.
Imagine trying to say 'hello' but 'goodbye' comes out instead—heterolalia is like your brain and mouth are having a miscommunication that you can't control, which shows how complex language processing really is!
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