The discovery of extensive nonceramic occupations associated with early domesticates at Mehrgarh, dated to pre-6000 B.C. (Jarrige and Meadow, 1980). … - Jim G. Shaffer

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.

A diffusion or migration of a culturally complex ‘Indo-Aryan‘ people into South Asia is not described by the archaeological record.

While lacking fullest data, there is a growing consensus that the Harappan culture originated as a result of local cultural developments. "Mesopotamian" inventions are not needed to explain it.