Since stamp seals were not available to everyone in a social group, and because their inscriptions most likely reflect titles and/or personal names, … - Jim G. Shaffer

[the demographic eastward shift of the Harappan population during the decline of their cities, i.e. an intra-Indian movement from Indus to Ganga,] “is the only archaeologically documented west-to-east movement of human populations in South Asia before the first half of the first millennium BC”, while the archaeological record shows “no significant discontinuities” for the period when the Aryan invasion should have made its mark.

The modern archaeological record for South Asia indicates a cultural history of continuity rather than the earlier eighteenth through twentieth century scholarly interpretations of discontinuity and South Asian dependence upon Western influences. The cultural and political conditions of Europe's nineteenth and twentieth centuries were strong influences in sustaining this interpretation. It is possible now to discern cultural continuities linking specific social entities in South Asia into one cultural tradition. This is not to propose social isolation nor deny any outside cultural influence. Outside cultural influences did affect South Asian cultural development in later historic periods, but an identifiable cultural tradition has continued, an Indo-Gangetic Tradition linking diverse social entities which span a time period from the development of food production in the seventh millennium BC to the present.

The concept of an Indo-European or Indo-Aryan group of peoples has played a prominent role in interpretative studies of Old World history and archaeology. For almost 200 years, scholars and quasi scholars have attributed the linguistic, cultural, and racial affiliations of very disparate groups to a common Indo-Aryan heritage. In such widely seperated areas as Europe and India, many significant cultural changes recorded for the first and second millennia B.C. are attributed to an influx, or invasion, of Indo-Aryan peoples who shared a common cultural base and who were responsible for important socioeconomic and linguistic changes in the areas they invaded.