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"It took off like wildfire and before long people were getting so fast at texting on phones, they could pretty much touch-type on a numeric keyboard," he said.

I’d learned how to touch-type in middle school, and I was a good typist.

Even if you can touch-type on an ordinary keyboard, it’s tough to find the right position again if you take your hands off it.

Pure alexia, which is Mum’s diagnosis, is much more rare: She can still write and touch-type, but bizarrely, she cannot read.

That negates the ability to do any fast touch-type thumbing as I always needed to be watching the keyboard.