To reinforce the obvious-re Cochlear Implants, A DEAF person is NOT fixed just Assisted with the means of electronics. Easy to test-disconnect-what does one "hear"?
Aside: my experience with my Cochlear Implant
I acknowledge that not all DEAF persons are "suitable" for one That fact comes from Sunnybrook/Toronto since 1984- 2 out 3 DEAF person were "unsuitable" for a variety of medical reasons. Info given last year patients meeting.
aside: I was one of 1000-implanted.