← LearningIcebreaker

Iain McGilchrist

An icebreaker

A psychiatrist argues the brain's two hemispheres don't just handle different tasks but offer two fundamentally different ways of attending to the world — and that the narrower, analytic way has come to dominate Western culture. Neuroscientists dispute how cleanly that split actually holds.

Ask one of these · tap to take it
copy the questions
Worth knowing · 1 of 5
What's the core claim about the two hemispheres?
He argues the right hemisphere offers a broad, connected awareness of the living world, while the left hemisphere narrows focus to grab and manipulate isolated parts. Both are necessary, he says, but only when the right hemisphere stays in charge.
Worth knowing · 2 of 5
What's the book's larger argument about history?
He traces Western philosophy, art, and science across centuries, arguing the left hemisphere's narrow way of seeing has steadily displaced the right's broader one. That shift, he claims, has left modern life more fragmented and mechanical.
Worth knowing · 3 of 5
What's the strongest scientific objection to his thesis?
A review weighing brain-imaging meta-analyses found little support for such a clean, general split between the hemispheres, and argued the thesis lacks measures that would let evidence count against it.
Worth knowing · 4 of 5
Is he a practicing neuroscientist or a philosopher?
He taught English literature at Oxford before training in medicine and working as a psychiatrist, then turned to this large synthesis of neuroscience, philosophy, and cultural history. That mixed background shapes both the book's ambition and its critics' objections.
Worth knowing · 5 of 5
Has he responded to the neuroscience critics?
He has acknowledged that no complex activity, like language or emotion, belongs to one hemisphere alone, and has defended his thesis as being about differing ways of attending, not strict anatomical ownership. The scientific debate over his claims continues.
Words to know
Hemispheric lateralizationThe idea that certain mental functions are more associated with one brain hemisphere than the other.
Left hemisphereIn his account, the brain's narrower mode: analytic, abstracting, and focused on isolated, fixed parts.
Right hemisphereIn his account, the brain's broader mode: contextual, relational, and open to the whole, living world.
More words
BetweennessHis term for the relational quality he says the right hemisphere perceives and the left hemisphere strips away.
A voice · 1 of 3
Iain McGilchrist · Psychiatrist who developed the thesis

He argues, across a 2009 book and later work, that the brain's two hemispheres offer fundamentally different ways of attending to the world, and that Western culture has increasingly favored the narrower left-hemisphere mode.

A voice · 2 of 3
Michael Spezio · Neuroscientist who assessed the thesis against brain research

In a 2019 meta-analytic assessment he found little support in current neuroscience for the thesis, and argued it lacks the operational definitions and neural measures that would let evidence count against it.

A voice · 3 of 3
Wesley J. Wildman · Scholar who edited a special issue

With Sarah Coakley he co-edited a 2019 special issue of Religion, Brain & Behavior that put the hemisphere thesis in dialogue with neuroscientists, philosophers, and scholars of religion.

A line to leave them with
Two ways of paying attention — the argument is over which one is steering.
If they want more:
All topics
scroll to walk
1 / 14