Fritsch et al. (2019) further improved performance of this approach by substituting a neural LM (a LSTM model) for the n-gram LM, and report an improved AUC of 0.92.
it is currently unclear as to whether this level of accuracy is due to dementia-specific linguistic markers, or a result of markers of other significant differences between the case and control group such as age (x = 71.4 vs. 63) and years of education (x= 12.1 vs. 14.3) (Becker et al., 1994).