Why Do We Talk to Ourselves?

Do you mumble to yourself while looking for your keys, or pump yourself up in the morning with a bathroom mirror pep talk? It may actually be helpful—but only if you do it right.

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Vygotsky’s Theory of Cognitive Development

http://psychology.oxfordre.com/view/10.1093/acrefore/9780190236557.001.0001/acrefore-9780190236557-e-157#acrefore-9780190236557-e-157-bibItem-0067
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4538954/