Table 2.

Guidelines to classify PPA variants according to recommendations in consensus diagnosis criteria (Gorno-Tempini et al., 2011).⁷

PPA-G - Nonfluent/agrammatic variant (also known as progressive nonfluent aphasia)
A.	One osf the following core features must be present:
1.	Agrammatism in language production;
2.	Effortful, halting speech with inconsistent speech sound errors and distortions (apraxia of speech).
B.	At least 2 of 3 of the following ancillary features must be present:
1.	Impaired comprehension of syntactically complex (non-canonical) sentences;
2.	Spared single-word comprehension;
3.	Spared object knowledge.
PPA-S - Semantic variant (also known as semantic dementia)
A.	Both of the following core features must be present:
1.	Impaired object naming;
2.	Impaired single-word comprehension.
B.	At least 3 of 4 of the following ancillary features must be present:
1.	Impaired object knowledge, particularly for low-frequency or low-familiarity items;
2.	Surface dyslexia or dysgraphia;
3.	Spared repetition;
4.	Spared grammaticality and motor aspects of speech.
PPA-L - Logopenic variant (also known as logopenic progressive aphasia)
A.	Both of the following core features must be present:
1.	Impaired single-word retrieval in spontaneous speech and naming;
2.	Impaired repetition of phrases and sentences.
B.	At least 3 of 4 of the following ancillary features must be present:
1.	Phonological errors (phonemic paraphasias) in spontaneous speech or naming;
2.	Spared single-word comprehension and object knowledge;
3.	Spared motor speech;
4.	Absence of frank agrammatism.