“More specifically, we know that there is a continual tendency for the authenticity of right hemisphere ‘presencing’ to be transformed into an inauthentic ‘re-presenting’ in the left; in essence, what was living becomes a cliché. The experience of the inauthenticity of the right hemisphere’s world -as it is represented in the left- may then, logically, lead in one of two directions […]

In the first, we remain within the realm of homeostasis, of negative feedback, of ‘swings’ of the pendulum’. There is a natural reaction, resulting in a return to the authenticity of the right-hemisphere world itself. This, however, in turn is doomed soon to be co-opted by the left hemisphere and become inauthentic again.

In the second, however, there is not a return to the right-hemisphere world, but on the contrary a rejection of it, since it now comes to be seen as .intrinsically. — rather than .contingently. having become — inauthentic, and therefore as invalid. Instead of the corrective swing of the pendulum, therefore, 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 so much ground over time.”

— Iain McGilchrist, The Master and His Emissary