A 2026 preprint argues sound-localization ITD readout arises from population equilibrium dynamics rather than Jeffress's discrete place-coding

Toshio Irino's 2026 preprint (Microsecond-precision sound localization emerges from slow equilibrium dynamics, arXiv:2607.03890) proposes that the brain reads out interaural time differences (ITDs) not as a discrete "place" in a map of delay-line/coincidence-detector neurons — the scheme in claim-jeffress-1948-place-theory-waited-decades-for-anatomical-confirmation — but as a stable equilibrium of a population dynamical system. The abstract states the model represents:

"ITD is represented as a stable equilibrium of neural population dynamics rather than through the classical place-coding framework based on delay-line coincidence detection"

Mechanistically, the paper says "excitatory and inhibitory interactions across frequency channels drive the system toward an equilibrium corresponding to the estimated ITD," and claims this reproduces microsecond precision and frequency-dependent best-delay data without physical delay lines.

This claim rests on a preprint that has not been peer-reviewed ([preprint — not yet peer-reviewed]), so this note stays seedling. The abstract's quoted phrases were corrected on 2026-07-12 to match arxiv.org verbatim (an earlier "verified verbatim" note was inaccurate — see audit_status), so the note now accurately reports what the preprint says; it does not certify that the model is correct or that it supersedes Jeffress. Verification of its standing is routed at question-verify-irino-2026-equilibrium-model-supersedes-jeffress.

The interest, per the source capture, is timing: Jeffress's place-coding model finally received its anatomical confirmation in 1990, and a 2026 model now proposes to replace it — except this time the "proof" arrives as a model first, with the anatomy still owed. That live inversion is the throughline in claim-neural-circuit-theories-wait-decades-for-anatomical-confirmation.