Takeaway
Repetition deficits in progressive aphasia (PPA) are associated with damage to an indirect pathway that connects temporal and frontal regions via the parietal lobe.
Why this matters
It is unclear if repetition deficits in PPA are related to lesions of the arcuate fasciculus (direct pathway) or the inferior parietal lobe (indirect pathway).
The findings suggest that both the temporo-parietal cortex and the anterior and posterior segments should be included in updated language networks for educational and clinical uses.