Some scholars have suggested that the same influences and people may have spread in both directions, from an origin around the fertile crescent, ancient Persia (modern-day Iran), or the Middle East. And there does seem to be evidence that wheat was adopted in India beginning about 9,000 years ago and that by about 8,500 years ago, wheat cultivation had reached central India and the Ganges River valley.
It surprised me to realize that some ideas about the Aryan arrival were influenced more by European assumptions than by actual evidence. I really want to know how much of cultural and technological development in other parts of the world was similarly influenced by both local experimentation and indirect contact with other regions, because I know it must be common.