beuatiful bel, they gods must love you, the book was
An Anthropologist on Mars, (pub 1995) and on Dr Sacks' web page, they very essay is presented...
EDITtry it now-- then click on typewriter ((for writings), and find the book, then click on exerpt in left hand frame...
http://www.oliversacks.com/

you can read it for yourself!
(sorry for not checking the link..)
(i certainly would recommend the whole book--or anyone of his books.. and to meet him in person is a delight.. (just an informal book signing.. after a lecture.) he has a wonderful sense of humor and humanity about him.