He hears his own voice and imitates it.

In this sort of imitation he simply allows his instinct to reproduce what he hears without control or interference from him.

He does not improve, but goes on making the same sounds with the same mistakes again and again.

But a little later he begins what is called "persistent imitation"-- the "try-try-again," already spoken of--which is a very different thing.

Persistent imitation shows unmistakably the presence of will.