My grandfather was bilingual, but his native tongue was Arabic. He held off dementia until his 90's, but when it finally set in, it hit hard. It got to the point where he often gave up trying to speak because he couldn't finish the sentence without forgetting a word he wanted and getting frustrated.
Surprisingly, however, he often remembered the word in English and started speaking that instead. To use a computer analogy, it is as though the sector of his brain where the Arabic was stored had become corrupted, while the English sector was still readable.
The same happens with my grandmother but the other way around.
She doesn't speak her second language anymore, she has returned to the one of her childhood, but it seems like she understand it yet.
My grandfather was bilingual, but his native tongue was Arabic. He held off dementia until his 90's, but when it finally set in, it hit hard. It got to the point where he often gave up trying to speak because he couldn't finish the sentence without forgetting a word he wanted and getting frustrated.
Surprisingly, however, he often remembered the word in English and started speaking that instead. To use a computer analogy, it is as though the sector of his brain where the Arabic was stored had become corrupted, while the English sector was still readable.