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A point worth noting is that the caregiver reinforcement need not be planned (McLaughlin, 2006) nor should it be continuous to increase nonechoic, echoic, or self-echoic babbling.
22-25, 43-52 (in his chapters "Questions of Poetry" and "Poetic Answers"), all of which are nonechoic and serve different strategies from those that will emerge in our inquiry.