Mille Plateaux: schizophrenia and unfinished business.

Dr Jack Parry 29 April 2026

keywords: schizophrenia adolescence myelin clozapine haloperidol cannabis montelukast Deleuze plateau white matter

The child of a close friend of mine has schizophrenia, which emerged with the onset of adolescence. I have watched them travel this long road from medication to medication, to dietary monitoring and every avenue open to them. I am not a psychiatrist and I have no clinical authority here. What I have is the question that road left behind, and thirty years of following biology to where it may point.

What I want to offer is not an explanation of what happened to their child. I want to give a different way of seeing what schizophrenia is, one that the standard account, built on dopamine and synaptic excess, has never quite managed to say.

In January 2026, researchers at Kyushu University published a finding that quietly dismantled the dominant story of adolescent brain development. The story had been this: adolescence is primarily a process of subtraction, of synaptic pruning, the brain cutting away what is not being used and refining what remains. The Kyushu team, using a technique that made brain tissue transparent under high-resolution microscopy, found something the pruning story had missed. The adolescent brain is also building: dense new clusters of synapses forming in precise stretches of the cortex’s output neurons during a tight developmental window. When the researchers examined mice carrying mutations in genes linked to schizophrenia, these clusters failed to form.

What the paper did not say, because it was looking entirely at grey matter, is that the same window in which these synaptic clusters are forming is the most intensive period of frontal white matter myelination in the entire lifespan. The two processes are not separate. The grey matter is building new capacity to receive. The white matter is building the accumulated condition that will meet what is received. Both are happening simultaneously, in the same neurons, in the same weeks.

When that window closes without either process completing, the result is a brain in which signal arrives but nothing adequate is there to meet it. The chiasm, the encounter between incoming experience and the myelinated self that has accumulated to receive it, does not form properly. Not because the world has changed. Because the structure that was supposed to meet the world was interrupted before it was finished.

The standard account of schizophrenia places the pathology in dopamine. Too much mesolimbic activity, producing the positive symptoms: the voices, the visions, the sense that the world has been reorganised around the self. The antipsychotics that followed from this account block dopamine receptors. They reduce the positive symptoms in many patients. They do not address the cognitive symptoms, the poverty of thought, the inability to sustain attention, the fractured relation to time, which are the symptoms most correlated with white matter disruption in the frontal and association pathways.

Postmortem studies find reduced numbers of oligodendrocytes in the prefrontal cortex of people with schizophrenia. DTI imaging finds disrupted white matter microstructure in the exact pathways connecting prefrontal cortex to the rest of the brain. The degree of disruption tracks with cognitive severity. The white matter literature has been saying for twenty years that schizophrenia is at least partly a disease of incomplete myelination in the adolescent developmental window. The dopamine account has been too loud for it to be heard clearly.

The onset of schizophrenia is itself a white matter story. It emerges in late adolescence to early adulthood, with a peak in males between seventeen and twenty-five and in females slightly later. The gender difference in onset age corresponds almost exactly to the gender difference in frontal myelination timing: female brains complete the process somewhat earlier. The prodrome, the months or years of subtle perceptual changes and social withdrawal before full psychosis emerges, maps onto the developmental window. The plateau is being laid down and something is going wrong in the layering before it becomes visible as breakdown.

Cannabis use in adolescence is the most consistently identified environmental risk factor for schizophrenia in genetically susceptible individuals. The two cigarettes article on this site establishes that the endocannabinoid system is directly involved in OPC maturation and myelination, and that OPCs produce their own endocannabinoids as part of their developmental process. Heavy exogenous cannabinoid exposure during the exact window when frontal white matter is completing its stratification introduces a powerful signal into a process that depends on precise timing. The plateau is being laid down and the layering is being disrupted from outside.

Montelukast, one of the most prescribed drugs in children and adolescents for asthma and allergies, carries an FDA black box warning for neuropsychiatric events including psychosis, issued in 2020 after years of accumulating reports. Montelukast antagonises GPR17, a receptor on OPCs that acts as a brake on their differentiation. Releasing that brake promotes OPC maturation, which is why montelukast has been investigated as a potential remyelination therapy in MS. But GPR17 is also part of the timing mechanism that regulates when and how fast OPCs mature during development. In an adolescent whose frontal white matter is in the middle of its critical stratification, altering the pace of that process is not neutral. The FDA warning was issued on the basis of phenomenology. The white matter developmental window provides the mechanism that the warning lacked.

Haloperidol reduces glycolysis in oligodendrocytes. This was established in a 2014 study comparing its effects directly with clozapine in oligodendrocyte cultures. The drug that dominated schizophrenia treatment for decades addresses dopamine symptoms while making the metabolic environment of the white matter worse.

Clozapine does the opposite. It improves glucose uptake and lactate production in oligodendrocytes. It enhances oxidative phosphorylation. It increases the expression of galactocerebroside, a primary lipid component of the myelin sheath. The drug of last resort, the one that works when nothing else does, is also the drug that most directly supports the residual myelination process in the adult brain.

Nobody designed clozapine to work in white matter. The discovery that it does is incidental to the dopamine framework within which it was developed and tested. The family on the long road from haloperidol to clozapine was travelling, without knowing it, from a drug that addressed grey matter symptoms while compromising white matter, toward a drug that does both.

The metabolic side effects of clozapine, the weight gain, the glucose dysregulation that requires ongoing monitoring, are widely described as the price of its efficacy. The oligodendrocyte biology suggests they may be two faces of the same process. Myelin lipid synthesis is metabolically expensive. The systemic metabolic consequences of clozapine and the white matter support it provides may not be separable.

Gilles Deleuze and Félix Guattari published A Thousand Plateaus in 1980. A plateau, in their usage drawn from Gregory Bateson, is a self-sustaining region of intensity, a stratum of experience that does not build toward climax or resolution but maintains itself as a continuous surface. The book itself is structured as plateaus rather than chapters, each one a layer that can be entered from any point.

The myelin sheath is the literal thousand plateaus. Membrane layer wrapped upon membrane layer, each one a stratum, the accumulated geology of a life inscribed in lipid. Deleuze took the concept from geology. Myelin is geology. He was pointing at the right structure without knowing what it was called.

In Anti-Oedipus, written with Guattari eight years earlier, schizophrenia is the revolutionary figure: the schizo whose desire flows freely, escaping the codes that capitalism uses to capture and organise libidinal energy. The schizo is celebrated as the one who breaks territorialisation, who refuses the organised channels, who flows without a bed.

The white matter literature says something different. The schizo does not flow freely because they are free. They flow without coherence because the geological bed that would have channelled the flow was never finished. The plateau formation was interrupted in the developmental window when it should have been completed. What Deleuze read as liberation from structure is the experience of a structure that was supposed to form and did not.

Deleuze was not wrong that something in schizophrenia escapes ordinary territorialisation. He was wrong about what to celebrate in that escape. The river without a bed is not freedom. It is flood.

Mille Plateaux: schizophrenia and unfinished business.

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