In the novel Somebody, Please Tell Me Who I Am by Henry Mazer and Peter Legranis, which character has a disability?

In Harry Mazer's novel "Somebody, Please Tell Me Who I Am," the protagonist, Ben Bright, experiences traumatic brain injury (TBI) as a soldier in Iraq, which causes physical and emotional disabilities. The novel effectively conveys Ben's journey from total breakdown to struggle for recollection and self-definition to triumph of spirit -- without necessitating a final, miraculous, physical recovery to his pre-war state. After sustaining TBI, Ben literally cannot remember who he is or any details of his life thus far; the explosion also incapacitates his ability  to move and even speak. Consequently, the healing process is grueling and painful, as unwanted flashbacks re-trigger trauma, impeding Ben's ability to integrate old memories into his present life and sense of self. This is further complicated by the fact that he doesn't remember anyone from his previous life except his friend Chris, which makes his fiancee, Ariela, extremely upset; this highlights the collateral consequences of Ben's disability on his loved ones.