The other Ancient Greek dialects, Ionic, Doric, Aeolic, and Arcadocypriot, likely had the same three-way distinction at one point, but Doric seems to have had a fricative in place of /tʰ/ in the Classical period, and the Ionic and Aeolic dialects sometimes lost aspiration (psilosis).
What additional point is made about the main subject discussed in the passage?
the Ionic and Aeolic dialects sometimes lost aspiration (psilosis)