[joesavage]

I have aphantasia and love the analogy to hashing. It matches my experience quite closely in as much as I can't really imagine faces in the abstract, but can verify a match in the real world with ease. Reminds me of NP-hard problems in that respect – verification is easy, calculation is hard.

With respect to not being able to imagine music though, I don't think the two are necessarily linked. I most definitely get earworms, and as a guitarist rely heavily on my "mind's ear".