In both instances, the Indo-Aryan concept was never subjected to rigorous validation beyond the field of historical linguistics. Linguistic reconstru… - Jim G. Shaffer

Most prior interpretations attributed significant cultural developments, except early hunting-gathering adaptations, to external factors such as ethnic intrusions or invasions, diffusing ideas and technologies developed outside the region, usually in the West. Current information, however, suggests that these earlier, still persisting interpretations cannot explain the cultural complexities now found in the archaeological record.

The current archaeological and paleoanthropological data simply do not support these centuries old interpretative paradigms suggesting Western, intrusive, cultural influence as responsible for the supposed major discontinuities in the South Asian cultural prehistoric record.

...thus there is no “Vedic night” separating the prehistoric/protohistoric from the early historic periods of South Asian culture history. These data reinforce what the site of Mehrgarh describes - an indigenous cultural continuity in South Asia of several millennia.