It is a part of an excellent book: https://en.wikipedia.org/wiki/The_Man_Who_Mistook_His_Wife_f...
which is recommended for anyone who is interested in how the brains work.
Interestingly enough, the article above links to Blindsight book: https://en.wikipedia.org/wiki/Blindsight_(Watts_novel) which is also excellent and discusses somewhat related topics, though in a fictional setting.