If speech is internalized to become verbal thought, then we need to develop the best speech possible.
If Vgotsky is correct about speech being internalized to become a major part of the verbal thought process, then the quality of that speech becomes even more critical.
For children entering kindergarten, if their speech is rich in vocabulary and grammatical nuances, their verbal thought processes will be best equipped to capitalize on what school has to offer. These children will typically enjoy school and have the best chances of succeeding. But if their speech lacks these assets at the time it is internalized, these children will be unable to grasp the full meaning of stories, instructions and much of the teaching materials.
But there is another problem also. We talked earlier about how the nonlinguistic child responds directly to stimuli. This is action without inhibition.