It's great that somebody studied her writing to map the progress of the disease but it's a pity they only sampled three books so it gives no insight into the rate of decline or how early it began to diverge from normal age related mental decline.
".. linguistic creativity dwindled markedly over an almost 20-year period" is based on comparing one book at the beginning of that period and one at the end. We have no idea if it really dwindled over 20 years or all happened quickly on the final year. This is what's most interesting to me - both the possibility of very early diagnosis and being able to predict the rate of decline so you can make informed decisions about how to manage your life if you've been diagnosed.
".. linguistic creativity dwindled markedly over an almost 20-year period" is based on comparing one book at the beginning of that period and one at the end. We have no idea if it really dwindled over 20 years or all happened quickly on the final year. This is what's most interesting to me - both the possibility of very early diagnosis and being able to predict the rate of decline so you can make informed decisions about how to manage your life if you've been diagnosed.