Terry Prone: Hemingway's cocktail of brain chemicals and concussion could have been dementia

In retrospect, it’s possible to be pretty sure that the repeated instances of concussion did cumulative damage to his brain, causing him to self-medicate with alcohol

Ernest Hemingway in June 1961 at the home of a Mayo Clinic doctor with two members of the doctor's family. He hardly exists and — at 61 years of age — looks so fragile and shrunken, he could be two decades older.

Two photographs, taken only a few years apart, of ostensibly the same man: Ernest Hemingway. Impelling, the story their contrast tells.

The first was taken in 1957 by Yousuf Karsh, a leading 20th-century photographer who branded himself as “Karsh of Ottawa”.