Sources for scientific journals are provided below. New videos come out every Thursday so subscribe for more videos.
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Sources
http://www.ncbi.nlm.nih.gov/pubmed/69...
http://psiexp.ss.uci.edu/research/tea...
http://www.hamiltonproject.org/files/...
http://www.jstor.org/stable/144718?se...
http://onlinelibrary.wiley.com/doi/10...