There was the following passage in New York Time’s (May 17) article describing the scene of Sandy Bem, a Cornell psychology professor getting diagnosis of whether she has the sign of Alzheimer’s or not by a neuropsychologist. She chose euthanasia to confront the progressive decay of her self-identity due to Alzheimer’s in the end:
“He (doctor) read her a list of words and had her recall as many as she could. He gave her two numbers and two letters and asked her to rearrange them in a particular order: low letter, high letter, low number, high number.” - The New York Times
I know lower case letters and upper case letters, but I’ve never heard of ‘low letter’ and ‘high letter.’
I searched the meanings of ‘low letter’ and ‘high letter’ on Google, but found no source telling the definition. What do they mean?