Within the depth-psychology corpus, 'hemisphere' functions not merely as an anatomical designator but as a conceptual fulcrum around which competing theories of mind, attention, selfhood, and reality are organized. Iain McGilchrist stands as the dominant voice, arguing across both The Master and His Emissary (2009) and The Matter With Things (2021) that the two cerebral hemispheres do not simply divide cognitive labour but enact fundamentally different orientations toward existence: the right hemisphere apprehending the world as a living, contextual, relational whole; the left hemisphere re-presenting it as abstracted, categorised, and manipulable. McGilchrist's central thesis is that Western civilization has progressively elevated left-hemisphere modes of attention at catastrophic cost. Daniel Siegel reinforces a complementary view, mapping hemispheric asymmetry onto relational and developmental registers, identifying the right hemisphere as the seat of nonverbal, embodied, emotionally resonant experience. Julian Jaynes contributes a historical-evolutionary dimension, speculating that the speechless right hemisphere once housed the 'divine voices' of the bicameral mind. The key tensions in this literature concern dominance — which hemisphere is truly 'major'? — and the asymmetry of inhibition: the left hemisphere actively suppresses right-hemisphere functioning, yet cannot substitute for it. Hallucination, delusion, prosopagnosia, and disorders of identity are overwhelmingly linked to right-hemisphere damage, complicating any simple equation of the right hemisphere with mere supplementary colouring.
In the library
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the right hemisphere damage may completely alter the way in which we stand in relation to the world, and fundamentally change our mode of being, has gone until recently virtually unnoticed
McGilchrist argues that the right hemisphere is not 'minor' or 'silent' but constitutive of our fundamental mode of being-in-the-world, and its historical neglect reflects a dangerous cultural bias toward left-hemisphere values.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009thesis
attentional dominance lateralises even more strongly to the right hemisphere than speech does to the left; and left-handers still display right-hemispheric attentional dominance in 81% of cases
McGilchrist establishes that the right hemisphere holds primacy not only in broad attention but in the very structure of attentional dominance, overturning the conventional association of dominance with the speech-bearing left hemisphere.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021thesis
attentional dominance lateralises even more strongly to the right hemisphere than speech does to the left; and left-handers still display right-hemispheric attentional dominance in 81% of cases
This passage grounds McGilchrist's claim that right-hemispheric attentional sovereignty is the more fundamental lateralised asymmetry, deeper even than the lateralisation of language.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021thesis
nearly all delusions, as well – in particular the more extravagant ones – are due to right hemisphere damage or dysfunction
McGilchrist links the full range of reality-distorting delusions to right-hemisphere dysfunction, positioning the right hemisphere as the guardian of accurate reality judgment.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021thesis
nearly all delusions, as well – in particular the more extravagant ones – are due to right hemisphere damage or dysfunction
McGilchrist consolidates clinical evidence to argue that the right hemisphere is indispensable for veridical perception and sound judgment about reality.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021thesis
There is active inhibition of right hemisphere language by the left hemisphere, which comes to light when the left hemisphere is suppressed; if the inhibitory effect of the left hemisphere is attenuated or suppressed, the right hemisphere proves to have a considerable vocabulary
McGilchrist demonstrates a structural asymmetry of inhibition — the left hemisphere actively suppresses the right, not vice versa — which has profound implications for understanding the dominance hierarchy between the hemispheres.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021thesis
There is active inhibition of right hemisphere language by the left hemisphere, which comes to light when the left hemisphere is suppressed; if the inhibitory effect of the left hemisphere is attenuated or suppressed, the right hemisphere proves to have a considerable vocabulary
This passage reveals that the left hemisphere's apparent dominance in language is partly a product of active inhibition rather than superior capacity, a key argument in McGilchrist's broader thesis.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021thesis
Where the left hemisphere is more concerned with abstract categories and types, the right hemisphere is more concerned with the uniqueness and individuality of each existing thing or being.
McGilchrist articulates a foundational ontological distinction: the right hemisphere attends to particulars and lived individuals while the left hemisphere abstracts into generic types, a difference with sweeping philosophical consequences.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009thesis
Anything that requires indirect interpretation, which is not explicit or literal, that in other words requires contextual understanding, depends on the right frontal lobe for its meaning to be conveyed or received.
McGilchrist establishes contextual understanding, metaphor, and pragmatics as specifically right-hemisphere competencies, positioning the right hemisphere as the organ of meaning in its fullest sense.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009thesis
there would seem to be a partisanship amongst scientists in the left hemisphere's favour, a sort of 'left-hemisphere chauvinism' at work
McGilchrist diagnoses an ideological bias within neuroscience itself, arguing that the field's very language betrays a cultural prejudice that mirrors the left hemisphere's own self-aggrandising tendencies.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009supporting
the critical factor is what the right hemisphere communicates to the left; input from the left to the right does not appear to improve performance significantly
McGilchrist shows that inter-hemispheric communication is directionally asymmetric: the right hemisphere's output is decisive for performance, while the left hemisphere's contribution to the right is negligible.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
the critical factor is what the right hemisphere communicates to the left; input from the left to the right does not appear to improve performance significantly
This passage reinforces McGilchrist's thesis that the right hemisphere plays the constitutive role in cognition, with information flowing meaningfully from right to left but not in the reverse direction.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
An analysis of a large number of previously published cases of auditory hallucinations where they were due to unilateral brain lesions shows that in almost 100% of such cases the lesions are right-sided.
McGilchrist marshals clinical evidence linking auditory hallucinations almost exclusively to right-hemisphere lesions, supporting his broader argument about the right hemisphere's central role in constructing reality.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
An analysis of a large number of previously published cases of auditory hallucinations where they were due to unilateral brain lesions shows that in almost 100% of such cases the lesions are right-sided.
The near-total lateralisation of hallucinatory experience to right-hemisphere pathology consolidates McGilchrist's argument that this hemisphere is indispensable to the stable construction of perceived reality.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
John Cutting refers to an 'overwhelming link with right hemisphere damage'. Patients with this disorder may develop the belief that someone they know is duplicated in different places at different times
Delusional misidentification syndromes such as Fregoli and Capgras are linked to right-hemisphere damage, illustrating how the right hemisphere maintains the coherent identification of persons within lived reality.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
John Cutting refers to an 'overwhelming link with right hemisphere damage'. Patients with this disorder may develop the belief that someone they know is duplicated in different places at different times
McGilchrist deploys delusional misidentification syndromes as clinical evidence that the right hemisphere is the hemisphere of personal identity and reality-anchored recognition.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
The right hemisphere's language is one of nonverbal sensations and images. In sum, the general impression of… the right hemisphere's 'reality,' its constructed representational world, will contain the information derived from the internal states of others.
Siegel positions the right hemisphere as the organ of nonverbal, relational, and embodied knowing, grounding intersubjectivity and emotional attunement in its representational architecture.
Siegel, Daniel J., The Developing Mind: How Relationships and the Brain Interact to Shape Who We Are, 2020supporting
the right hemisphere presents an array of possible solutions, which remain live while alternatives are explored. The left hemisphere, by contrast, takes the single solution that seems best to fit what it already knows and latches onto it.
McGilchrist contrasts the right hemisphere's open, exploratory problem-solving with the left hemisphere's narrow, confirmatory strategy, arguing that cognitive flexibility is fundamentally a right-hemisphere virtue.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009supporting
The superiority of the right hemisphere for recognising faces is yet another lateralised difference that goes a considerable way down the evolutionary chain – for example, it is even present, believe it or not, in sheep
McGilchrist demonstrates that right-hemisphere superiority in face recognition is evolutionarily ancient and phylogenetically widespread, suggesting it is foundational to social cognition across species.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009supporting
We can even have, as personalities, characteristic and consistent biases towards one or other hemisphere, certainly for particular kinds of experience, associated with differing degrees of arousal and activation in either hemisphere.
McGilchrist introduces the concept of 'hemispheric utilisation bias' to explain how individual personality differences reflect stable asymmetric reliances on one hemisphere's cognitive style over the other.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009supporting
Clearly the left hemisphere has difficulty understanding what one might call human meaning. Its attempts to understand are mechanical and literalistic.
McGilchrist argues that the left hemisphere's literalism and mechanical processing render it structurally incapable of apprehending the full depth of human meaning, which requires right-hemisphere participation.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
Clearly the left hemisphere has difficulty understanding what one might call human meaning. Its attempts to understand are mechanical and literalistic.
This passage locates the left hemisphere's fundamental limitation in its inability to grasp meaning beyond rule-following, positioning the right hemisphere as the locus of genuine hermeneutic capacity.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
some broad consistent differences in hemisphere specialisation are striking when one comes to review the available evidence. Alertness and sustained attention… are the ground of our being in the world
McGilchrist frames hemispheric differences in sustained attention and alertness not as technical curiosities but as the very ground of existential presence, linking neuroscience to phenomenology and spirituality.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009supporting
what is their important function, since it must have been such to preclude its development as an auxiliary speech area? If we stimulate such areas on the right hemisphere today, we do not get the usual 'aphasic arrest'
Jaynes raises the question of the right hemisphere's prehistoric function, suggesting it once served a purpose profound enough to prevent its co-option as a secondary language area, a premise foundational to his bicameral mind theory.
Julian Jaynes, The Origin of Consciousness in the Breakdown of the Bicameral Mind, 1976supporting
We will be looking at the roles of the two hemispheres in the normal process of reaching beliefs and making judgments throughout Part II
McGilchrist positions hemispheric differentiation as central to epistemology itself, framing the entire inquiry into belief, judgment, and self-deception through the lens of hemisphere-specific processing.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
Roundness and the image of the sphere come and go with the influence of the right hemisphere. They were central to Romanticism.
McGilchrist speculatively connects the cultural-historical prevalence of circular and spherical imagery to the ascendancy of right-hemisphere sensibility, linking neurological theory to the history of ideas.
McGilchrist, Iain, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009aside