Runaway Narrowing

Definition

McGilchrist argues Western culture has not simply oscillated between broad, contextual (right-hemisphere) and narrow, analytic (left-hemisphere) modes over history — it has ratcheted, with each swing back toward narrowness going further than the last. The normal corrective mechanism is a "swing of the pendulum": an authentic, living mode of experience calcifies into a lifeless representation, this inauthenticity is felt, and there is "a natural reaction, resulting in a return to the authenticity of the right-hemisphere world." But he identifies a second, pathological path: instead of returning to the richer mode, the culture concludes the richer mode was never valid to begin with and doubles down on the narrow one — converting a self-correcting negative-feedback loop into a self-entrenching positive-feedback one.

In the Book

McGilchrist traces this across Part Two: the flourishing of individualized, empathic, right-hemisphere-inflected portraiture and poetry in classical Greece (evidenced, he argues, by Hufschmidt's study of 50,000 depictions of the human face showing a shift in gaze orientation from the sixth century BC), followed by successive later periods — the Renaissance and Reformation, the Enlightenment, the Industrial Revolution, and Modernism — that each swing further toward abstraction, mechanism, and decontextualized certainty. He states the mechanism directly: "there is a continual tendency for the authenticity of right hemisphere 'presencing' to be transformed into an inauthentic 'representing' in the left; in essence, what was living becomes a cliché... Instead of a corrective swing of the pendulum... there is a loss of homeostasis, and the result is positive feedback, whereby the left hemisphere's values simply become further entrenched. This also helps to explain why the left hemisphere necessarily gains ground over time."

Why It Matters

This distinguishes ordinary oscillation from a specific failure of oscillation: a system that should self-correct instead treats each excursion as evidence that the correction itself was illegitimate, and locks in further from balance. It is diagnostically useful anywhere a corrective mechanism (market correction, cultural backlash, organizational course-correction) stops restoring the mean and instead becomes evidence used to justify the very drift it was supposed to reverse — the difference between a thermostat and a runaway process that has convinced itself the thermostat was wrong.