Mom has been hard of hearing for years, and she has never been a good listener, but lately it's been a little different. Sometimes her responses are incoherent. Sometimes I'll say something and she'll stare blankly at me as if I just asked her "What's 371 divided by 13?" before responding. Sometimes I'll speak at a normal tone of voice and she'll understand from across the room. A while ago I was sitting across the table and said, in a normal tone of voice, "Take your pills, Mom," and it was as if I didn't say anything. I know her hearing isn't that bad. (And she has no problem with taking her pills.)
Is it possible for cognitive decline to cause hearing loss or comprehension problems that seem like hearing loss? Is there a way I can test this through observation?