Top five features, by absolute correlation with TIB class, in data from people without and with dementia. For example, “S1 → SQ” is a count of sentential structures that are also interrogative, and DT, NN, and PRP are determiners, nouns, and personal pronouns, respectively. Imageability and familiarity are scores obtained from the Bristol norms (Stadthagen-Gonzalez and Davis 2006).
| Control Features . | Dementia Features . |
|---|---|
| S1 → SQ (interrogative) | Num. of PRPs :: Num. NNs + Num. PRPs |
| Num. DTs | Num. NNs |
| Num. DTs :: Num. words | Num. NNs :: ( Num. NNs + Num. VBs) |
| Mean imageability | NP → PRP (personal pronoun) |
| Mean familiarity | Mean NN imageability |
| Control Features . | Dementia Features . |
|---|---|
| S1 → SQ (interrogative) | Num. of PRPs :: Num. NNs + Num. PRPs |
| Num. DTs | Num. NNs |
| Num. DTs :: Num. words | Num. NNs :: ( Num. NNs + Num. VBs) |
| Mean imageability | NP → PRP (personal pronoun) |
| Mean familiarity | Mean NN imageability |