hallucinations are the consequence of failing to monitor accurately the source of thoughts and images. It is therefore especially interesting that British developmental psychologists Charles Fernyhough and James Russell have recently found an association between efficiency at source monitoring in early childhood and the use of private speech in social settings – children who speak a lot to themselves when other people are present tend to be good at discriminating between their thoughts and other people’s voices.67 Perhaps children learn to tell the difference between the external (‘real’) and
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