Some of Ong's interests:
- the historical development of visualist tendencies in Western philosophic thought
- the mathematical transformation of thought in medieval and early modern logic and beyond
- oral cyclic thought, which is characteristic of primary oral cultures, versus linear or historical or evolutionary thought, which depends on writing
- the movement from oral heroic poetry to mock-heroic poetry in print culture to the realist tradition in literature to the modern antihero
- the historical development in manuscript culture and print culture of the inward turn of personalized ego-consciousness, or individuality
- the new dimensions of orality fostered by modern communication media that accentuate sound, which Ong calls secondary orality as it succeeds from, relies on, and coexists with writing
- the origins and development of the Western educational system
- the role and effects of Learned Latin in Western culture