My five year old daughter asked me why we can't repeat the same word ad infinitum.
I have never thought about it before but she is right. Most people when given the task of saying a word, almost any word, will sooner or later get tongue tied and merge the syllables. It is not just boredom. You could bounce a ball until tired but then I guess there is a longer gap between bounces. If you reduce the time gap then we mess that up, too.
But saying a word is a simple thing and yet it is almost impossible to repeatedly say the word correctly. After 15 repetitions you start saying rubbish and need a break but it is not due to fatigue. Anyone with any thoughts?