I also think tdvance's hypothesis is very plausible. It sounds like it
applies to me. Needs library research, and if an answer doesn't turn
up, somebody needs to design an experiment to test it.

I have the problem of the original post, not often, but often to recognize
immediately what Andre was referring to. Certain letters and sounds get
confused, while others don't.

What I think is similar in effect but may or may not be similar in cause:
I sometimes find that I have typed a "b" instead of a "p". I am not a
touch-typist, and have to look at the keyboard frequently to be sure
my fingers are going to the right places, so I see the letters on the
keys. But the letter on the key is "B", not "b", so the difference should
be obvious. Dunno what's going on there.

Zero-One, What a post! Sure sounds like a stroke. Don't do that!

Coincidentally, I had a big white spot in the center of my field of vision
for a few minutes after I got out of bed this morning. Probably lack of
blood to the retinas, caused by low blood pressure, caused by lack of
food. I need to get to the grocery store.

I see "ration" where "ratio" is meant, a lot. If I recall correctly, I even
did it once myself, which really surprised me. I wonder if "formular" is
the same kind of deal, or if that's just how those people pronounce it.

-- Jeff, in Minneapolis

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"I find astronomy very interesting, but I wouldn't if I thought we
were just going to sit here and look." -- "Van Rijn"

"The other planets? Well, they just happen to be there, but the
point of rockets is to explore them!" -- Kai Yeves