Within the depth-psychology corpus, rationality emerges not as a straightforward cognitive virtue but as a contested and frequently problematized faculty whose scope, limits, and proper relationship to emotion, intuition, and embodied experience constitute one of the field's central preoccupations. Damasio launches a sustained critique of the Cartesian inheritance, demonstrating through neurological evidence that the brain systems associated with rationality — specifically the prefrontal structures governing personal and social decision-making — are inseparable from emotional processing; rationality divorced from somatic signaling produces not cleaner judgment but catastrophic dysfunction. McGilchrist extends this critique hemisperically, arguing that the left hemisphere's brand of sequential, analytic rationality is a subordinate instrument that must ultimately submit its products to the superordinate judgment of reason in its fuller, right-hemispheric sense — a formulation he traces from classical antiquity through Kant. Sri Aurobindo posits a 'supramental' rationality that transcends the mental-rational altogether, while Nussbaum recovers from Greek tragedy the insight that certain human truths are grasped only through suffering, rendering purely intellectualist rationality insufficient for ethical knowledge. Plato stands as the originating reference point, his tripartite soul establishing the architecture within which rationality's proper governance of appetite and passion has been debated ever since. The corpus consistently resists both the dismissal of rationality and its imperialism, seeking instead a calibrated integration.
rationality needs in turn to submit its workings to the judgment of reason at the end (Kant's regulatory role). Thus it is not that A (reason) … B (rationality), but that A (reason) … B (rationality) … A (reason) again.
McGilchrist argues that rationality is not self-grounding but must pass its outputs back to a superordinate reason, mirroring the cooperative circuit between the brain's hemispheres.
, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009thesis
a subset of these systems is associated with planning and deciding behaviors that one might subsume under the rubric 'personal and social.' There is a hint that these systems are related to the aspect of reason usually designated as rationality.
Damasio localizes rationality in the same neural systems that process emotion, suggesting that the two are functionally interdependent rather than opposed.
, Descartes' Error: Emotion, Reason, and the Human Brain, 1994thesis
this kind of vision, is what the rationality he has embraced leads to. Not by mere chance, not by a momentary caprice, but by the inexorable logic of the rationality to which he is committed … such a way of looking at other people — would be judged mad.
McGilchrist, citing Levin on Descartes, argues that an unchecked rationality produces a pathological alienation from the lived world of persons, amounting to a subtle clinical madness.
, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009thesis
while rational processing is important, it needs to be combined with other ways of intelligently understanding the world … it is historically a specific kind of mind, not human mind as such, which is subject to this compulsion.
McGilchrist, drawing on Weber and Gellner, argues that the compulsion toward mechanistic rationality is a culturally and historically specific pathology of left-hemisphere dominance, not a universal feature of human cognition.
, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021thesis
while rational processing is important, it needs to be combined with other ways of intelligently understanding the world … it is historically a specific kind of mind, not human mind as such, which is subject to this compulsion.
McGilchrist reiterates that exclusive reliance on rational processing is a historically conditioned disposition rather than the natural expression of human intelligence.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021thesis
there is a greater reason in all the operations of the Infinite, but it is not a mental or intellectual, it is a spiritual and supramental reason … what is magic to our finite reason is the logic of the Infinite.
Aurobindo posits a supramental rationality — a 'greater reason' operating by laws invisible to ordinary discursive thought — that frames human rationality as a limited and provisional instrument.
, The Life Divine, 1939thesis
it can't be reasoned towards, because reason is exactly what we are trying to evaluate, and it can only carry on unpacking what it is given; intuition, though far from fool-proof, is probably a better guide.
McGilchrist identifies the epistemological circularity inherent in using reason to evaluate reason, and proposes intuition as a corrective because it draws on the totality of experience rather than a single logical chain.
, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
The representation of reason given by retrospective analysis is bound to be only a partial account of the true reasoning process … frequently we do not recognize our sensations and ideas, when put into words ever so carefully.
Drawing on Newman, McGilchrist argues that formal, retrospective accounts of rationality inevitably distort the living process of reasoning, which is richer and more right-hemispheric than its verbal reconstruction implies.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
The right hemisphere is more involved with the living process as it happens, the left with the post-mortem dissection that occurs once it has stopped.
McGilchrist identifies analytic rationality with the left hemisphere's retrospective dissection of a process whose living reality belongs to the right hemisphere.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
serious moral philosophers now believe there is a calculus of morality, whereby we can tot up the costs and benefits, and come up with an answer. This is the fulfilment of Leibniz's dream of his famous abacus, and declaration calculemus.
McGilchrist critiques utilitarian moral calculus as the reductio ad absurdum of rationality's imperialist drive, exemplifying the dangers of applying quantitative rationality to domains that resist quantification.
, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
serious moral philosophers now believe there is a calculus of morality, whereby we can tot up the costs and benefits, and come up with an answer. This is the fulfilment of Leibniz's dream of his famous abacus.
McGilchrist identifies the trolley-problem genre of moral philosophy as symptomatic of a civilization captured by quantitative rationality at the expense of moral intuition and embodied judgment.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
the left hemisphere favours analytic, sequential 'processing', where the right hemisphere favours parallel 'processing' of different streams of 'information' simultaneously … One thing is established as (apparently) certain; that forms a platform for adding the next little bit of (apparent) certainty.
McGilchrist maps the sequential, cumulative logic characteristic of rationality onto left-hemisphere processing, distinguishing it from the right hemisphere's holistic, parallel apprehension.
, The Master and His Emissary: The Divided Brain and the Making of the Western World, 2009supporting
to grasp either a love or a tragedy by intellect is not sufficient for having real human knowledge of it … there is a kind of knowing that works by suffering because suffering is the appropriate acknowledgement of the way human life, in these cases, is.
Nussbaum argues that purely rational or intellectual grasp falls short of genuine ethical knowledge, which requires an affective acknowledgement that discursive rationality cannot supply.
, The Fragility of Goodness: Luck and Ethics in Greek Tragedy and Philosophy, 1986supporting
education and acculturation add a set of socially permissible and desirable decision-making strategies that, in turn, enhance survival … The neural mechanisms supporting the suprainst inctual repertoire may be similar in their overall formal design to those governing biological drives.
Damasio argues that the rational decision-making repertoire is built upon and continuous with biological drives, sharing formal neural architecture with instinctual systems rather than transcending them.
, Descartes' Error: Emotion, Reason, and the Human Brain, 1994supporting
Employing analysis, which works from the outside of its object, without listening to intuition, which inhabits the matter at hand from the inside, is like looking for the power of a poem in the translation, where it cannot be found.
McGilchrist contrasts the external, analytic mode of rationality with intuition's interior inhabitation of its object, arguing that analysis alone destroys the Gestalt it seeks to understand.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
Employing analysis, which works from the outside of its object, without listening to intuition, which inhabits the matter at hand from the inside, is like looking for the power of a poem in the translation, where it cannot be found.
McGilchrist illustrates the limits of analytic rationality by analogy with poetic translation, showing that progressive decomposition destroys the very meaning it was meant to illuminate.
, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
The action of rational, morally responsible agents is not only more complex and philosophically interesting; it is also the sort of action which matters most in ethics … the psychology of action plays a theoretical role like that which I have.
Inwood notes that Stoic ethics prioritized the analysis of fully rational action over non-rational behavior, making rationality the central category of moral psychology in the Stoic tradition.
, Ethics and Human Action in Early Stoicism, 1985supporting
The antinomies constitute for Kant what one might call roadblocks to reason; they prevent reason from going further … All the so-called problems of metaphysics — about God, the soul and the cosmos — are beyond human reason.
Louth presents Kant's antinomies as the definitive demonstration of the internal limits of rationality, establishing that certain domains — God, soul, cosmos — exceed its competence.
, Modern Orthodox Thinkers: From the Philokalia to the Presentsupporting
Kahneman's system 1 and system 2 cut the cake 'horizontally' (top brain versus bottom brain), whereas I am cutting it 'vertically' (left versus right). His systems 1 and 2 don't map onto left and right hemispheres.
McGilchrist clarifies that the fast/slow thinking distinction (Kahneman) does not coincide with the hemispheric division he employs, both hemispheres participating in both heuristic and deliberate processing.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021aside
Western culture overvalues the left-hemisphere way of viewing the world, heavily relying on it to validate information … McGilchrist attributed this excessively reductive scientism to a pathological undervaluation of the right hemisphere's experience of the world.
Dennett applies McGilchrist's framework to argue that Western culture's over-reliance on left-hemisphere rationality constitutes a collective pathology that suppresses myth, symbolism, and spirituality.
, Individuation in Addiction Recovery: An Archetypal Astrological Perspective, 2025aside
The maintainer of justice … is trying to strengthen the man; he is nourishing the gentle principle within him … in order that he may be able to keep down the many-headed hydra, and bring all into unity with each other and with themselves.
Plato's allegory of the soul's three parts frames rationality (the 'man') as the governing principle that must bring appetite and spiritedness into unity, establishing the classical template for rationality's normative authority.
, Republic, -380aside
limits of, 75, 166, 408-9; normative conception of, 20, 113, 160, 223; and passions, 46-7, 139, 201, 209, 233, 307; in Protagoras, 89-121; techne of, 94-7, 100, 105, 106-10.
Nussbaum's index entries for reason map its normative conception, its limits, and its relationship to passion, indicating the systematic scope of her engagement with rationality across Greek tragedy and philosophy.
, The Fragility of Goodness: Luck and Ethics in Greek Tragedy and Philosophy, 1986aside