My mother told me about a woman she got to know that had no sense of music anymore.
As some might know, until the 60s in Germany left-handed people were forced to learn to use their right-hand, before they realised that it was crap.
And she was one of these people.
However, this change form being left-handed to be right-handed can have some damage on your brain, and with this woman it was that she would hear music, but not see it as some good music, or bad music. There was no sense of melody anymore.
I've also heard of people that can't see faces. Some weird thing, but they really only see your face, but not the nose, mouth or anything.
It's really an interesting article and nice to know certain things.
And you see how our brain can be tricked. While not reacting to tickling ourselves, because it just ignores this information, we can get tickled by other people or whatever tickles us, and even after we saw that there is something our brain cannot use this information to ignore this tickling as well.
And a seventy percent loss of information is not very efficient.