Central Eurasia is a linguistic bottleneck, spread zone, and extinction chamber, but its languages had to come from somewhere. The locus of the IE spread is a theoretical point representing a linguistic epicentre, not a literal place of ethnic or linguistic origin, so the ultimate origin of PIE need not be in the same place as the locus.
American linguist
Johanna Nichols (born 1945, Iowa City, Iowa) is a linguist and professor emerita in the Department of Slavic Languages and Literatures at the University of California, Berkeley. She earned her PhD in Linguistics at the University of California, Berkeley, in 1973 with a dissertation entitled, "The Balto-Slavic predicate instrumental: a problem in diachronic syntax."
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The archaeological sources on which this summary is based... most often describe the westward cultures as derived from, or extensions from, the eastern ones. Mallory (1989) and Anthony (1991, 1995) interpret the directionality of cultural derivation as west to east. It is the east-to-west directionality of cultural derivation that would be consistent with the east-to-west linguistic trajectory, since spread of a whole culture is likely to involve language spread (and vice versa). A predominantly east-to-west directionality of cultural derivation and descent for the Eneolithic steppe would be a strong indication that the spread zone with its westward trajectories had taken shape. This is a purely archaeological question, but it is important to dating the rise of the linguistic spread zone.
The vast interior of Eurasia is a linguistic spread zone—a genetic and typological bottleneck where many genetic lines go extinct, structural types tend to converge, a single language or language family spreads out over a broad territorial range, and one language family replaces another over a large range every few millennia. The linguistic geography of the central and western grasslands, from at least the Neolithic until early modern times, has consisted of an overall westward trajectory of language spreads... The central Eurasian spread zone... was part of a standing pattern whereby languages were drawn into the spread zone, spread westward, and were eventually succeeded by the next spreading family.