Aged 1 Aphasia, Primary Progressive 1 Article 1 Cognition 1 Cortical thickness 1 Female 1 Humans 1 Length 1 Male 1 Memory, Short-Term 1 Middle Aged 1 Phrase repetition Primary progressive aphasia 1 Semantics 1 Temporal Lobe 1 adult 1 aged 1 clinical evaluation 1 cognition 1 compulsion 1 controlled study 1 cortical thickness (brain) 1 diagnostic accuracy 1 disease classification 1 disorders of higher cerebral function 1 female 1 human 1 major clinical study 1 male 1 middle aged 1