Neuschäfer argues that Origen provides valuable evidence for grammar, rhetoric, and textual criticism in the schools of the Imperial period. Also, he shows abundant testimony in the received corpus of writings from Origen in confirmation of what is independently known regarding philological studies in Alexandria and other centers of learning such as Athens. As several scholars have pointed out, the first-century BC. Alexandrian grammarian Dionysius Thrax, whose identity has been questioned, shows openness to currents beyond strictly Alexandrian sources. This is shown by the contributions of Stoic sources to his grammar. Neuschäfer is probably correct that it is broad shifts in Alexandrian school philology and not the dissemination of Pergamene Homer exegesis that is relevant to understanding Stoic material in Origen, the Pergamene school may have still contributed to knowledge of grammar and logic in all the major intellectual centers of the Imperial period.