SciShow explores a newly identified neurological condition, aphantasia, the inability to visualize things in your imagination, and gives tribute to Dr. Oliver Sacks, popular explorer of the human mind.
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Sources:
http://www.eurekalert.org/pub_release...
http://www.exeter.ac.uk/news/featured...
http://www.washingtonpost.com/nationa...
http://www.nytimes.com/2015/02/19/opi...
http://www.oliversacks.com/