Corollary Discharge Dysfunction in Schizophrenia: Evidence for an Elemental Deficit
Abstract
Evidence is accumulating that schizophrenia is characterized by dysfunction of efference copy/corollary discharge mechanisms that normally allow us to unconsciously recognize and disregard sensations resulting from our own actions. This dysfunction may give rise to subtle but pervasive sensory/perceptual aberrations in schizophrenic patients, altering their experience of their own overt and covert actions, as well as their interactions with the environment. It may also contribute to symptoms such as hallucinations and delusions, and may disrupt the motivation to engage with people and in activities. We developed neurophysiological paradigms to study motor-sensory feed-forward processes, or efference copy/corollary discharge mechanisms, in the speech-auditory system, and showed these processes to be deficient in chronic schizophrenia. Specifically, we observed neural responses during talking that made evident the suppressive consequences of a successful corollary discharge mechanism. We also observed synchronous neural activity preceding talking that we believe reflects the efference copy in action. Recently, we extended this neurophysiological research to the somatosensory system, again finding evidence of deficient motor-sensory feed-forward processes in schizophrenia. If dysfunction of this elemental mechanism is reliable, valid, and not the result of antipsychotic medications, it might represent a major new class of electrophysiological measures sensitive to a fundamental and ubiquitous pathophysiological process in schizophrenia.
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Efference copies play a role in tagging self-generated actions as self-generated, enabling a distinction between sensations from self-generated movements and sensations from changes in the external world.
“there is evidence to suggest that they also play a role in ''tagging'' self-generated actions as being self-generated, thereby enabling a distinction to be made between sensations resulting from self-generated movements and sensations resulting from changes in the external world.[53][54][55]”
From Schizophrenia, myelination, and delayed corollary discharges: a hypothesis (2012) · cites this paper as [55]
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- Authors
- Mathalon, D. H., & Ford, J. M.
- Affiliations
- San Francisco VA Medical Center (US)
- Corresponding author
- Mathalon, Daniel H.
- Venue
- Clinical EEG and Neuroscience
- Publisher
- SAGE Publications
- Published
- 2008-04
- Volume
- 39
- Issue
- 2
- Pages
- 82-86
- ISSN
- 1550-0594 (ISSN-L)
- 2169-5202
- OpenAlex
- W2025900028
- Cited by
- 60
- References
- 32
- Citations by year
- 2026: 1 · 2024: 3 · 2022: 5 · 2021: 4 · 2020: 4 · 2019: 5 · 2018: 7 · 2017: 3 · 2016: 5 · 2015: 4 · 2014: 2 · 2013: 2 · 2012: 4
- FWCI
- 2.58
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Clinical EEG and Neuroscience (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5r01mh058262-17)
- National Institute of Mental Health (R01MH040052, MH067967, K02MH067967, MH-58262, MH40052, R01MH-058262)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
- Life Sciences › Neuroscience › Cognitive Neuroscience › Free Will and Agency
- Social Sciences › Arts and Humanities › Philosophy › Mental Health and Psychiatry
- Keywords
- schizophrenia, corollary discharge, efference copy, somatosensory system, sensorimotor integration, hallucinations, delusions, neuronal synchronization, electrophysiological markers
- MeSH terms
- Auditory Pathways, Electroencephalography, Frontal Lobe, Hallucinations, Humans, Schizophrenia, Schizophrenic Psychology, Signal Processing, Computer-Assisted, Speech, Case-Control Studies
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