Every act of perception, is to some degree an act of creation, and every act of memory is to some degree an act of imagination. Oliver Sacks Happy 81st birthday, Oliver Sacks! The author of popular case studies of neurological disorders actually suffers from a disorder of his own— prosopagnosia , also known as face blindness.Goodreads.com definition Prosopagnosia is a neurological disorder characterized by the inability to recognize faces. Prosopagnosia is also known as face blindness or facial agnosia. The term prosopagnosia comes from the Greek words for “face” and “lack of knowledge.” Depending upon the degree of impairment, some people with prosopagnosia may only have difficulty recognizing a familiar face; others will be unable to discriminate between unknown faces, while still others may not even be able to distinguish a face