Defining the phenotype of schizophrenia: cognitive dysmetria and its neural mechanisms
Abstract
All research on schizophrenia depends on selecting the correct phenotype to define the sample to be studied. Definition of the phenotype is complicated by the fact that there are no objective markers for the disorder. Further, the symptoms are diverse, leading some to propose that the disorder is heterogeneous and not a single disorder or syndrome. This article explores an alternative possibility. It proposes that schizophrenia may be a single disorder linked by a common pathophysiology (a neurodevelopmental mechanism), which leads to a misconnection syndrome of neural circuitry. Evidence for disruption in a specific circuit is explored: the cortical-thalamic-cerebellar-cortical circuit (CCTCC). It is suggested that a disruption in this circuit leads to an impairment in synchrony, or the smooth coordination of mental processes. When synchrony is impaired, the patient suffers from a cognitive dysmetria, and the impairment in this basic cognitive process defines the phenotype of schizophrenia and produces its diversity of symptoms.
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CBM-iTBS has demonstrated benefits for psychiatric conditions such as schizophrenia.
“Noninvasive stimulation of the cerebellum with transcranial magnetic stimulation (TMS), specifically posterior cerebellum-targeted intermittent theta burst stimulation (CBM-iTBS), has demonstrated benefits for psychiatric conditions, such as schizophrenia, which manifest potentially cerebellum-mediated symptoms including mood dysregulation and cognitive dysmetria (Andreasen, 1999; Andreasen et al.”
From A double-blind, randomized, sham-controlled clinical trial of cerebellar intermittent theta burst stimulation for bipolar disorder: Safety, tolerability, mood and cognitive effects (2025) · cites this paper as Andreasen, 1999
Increased activity of dopaminergic neurons could lead to perception of salience in previously insignificant events, per Kapur's model of psychotic symptomatology.
“The increased activity of these dopaminergic neurons could in turn lead to the perception of salience in previously insignificant events, as per Kapur's 11 model of psychotic symptomatology.”
From Schizophrenia, myelination, and delayed corollary discharges: a hypothesis (2012) · cites this paper as [11]
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The Endophenotype Concept in Psychiatry: Etymology and Strategic Intentions
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Effectiveness of Cerebellar Circuitry Modulation in Schizophrenia: A Systematic Review
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- Authors
- Andreasen, N. C., Nopoulos, P., O’Leary, D. S., Miller, D. D., Wassink, T., & Flaum, M.
- Affiliations
- University of Iowa (US)
- Corresponding author
- Andreasen, Nancy C
- Venue
- Biological Psychiatry
- Publisher
- Elsevier BV
- Published
- 1999-10
- Volume
- 46
- Issue
- 7
- Pages
- 908-920
- ISSN
- 0006-3223 (ISSN-L)
- OpenAlex
- W2006883575
- Cited by
- 560
- References
- 156
- Citations by year
- 2026: 6 · 2025: 15 · 2024: 15 · 2023: 6 · 2022: 14 · 2021: 23 · 2020: 12 · 2019: 13 · 2018: 13 · 2017: 17 · 2016: 23 · 2015: 26 · 2014: 13 · 2013: 28 · 2012: 31
- FWCI
- 2.34
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Biological Psychiatry (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Mental Health (MH 40856, MH-31593, MHCRC-43271, R01MH040856)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
- Social Sciences › Arts and Humanities › Philosophy › Mental Health and Psychiatry
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Keywords
- schizophrenia, phenotypes, cognitive dysmetria, neuronal synchronization, symptom heterogeneity
- MeSH terms
- Brain Mapping, Cerebellum, Cerebral Cortex, Humans, Nerve Net, Phenotype, Schizophrenia, Schizophrenic Psychology, Thalamus, Neurocognitive Disorders
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