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Updated: Jul 12, 2026
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Measuring Contralateral Silent Period Induced by Single-Pulse Transcranial Magnetic Stimulation to Investigate M1 Corticospinal Inhibition
Published on: August 23, 2022
Relationship between P50 suppression and the cortical silent period
Bertram Möller1, Gregory A Light, Paul B Fitzgerald
1Schizophrenia Program, Centre for Addiction and Mental Health, Universty of Toronto, 250 College Street, M5T IR8, Toronto, Ontario, Canada.
Neuroreport
|August 23, 2007
Summary
Schizophrenia involves impaired brain inhibition. This study found P50 suppression, a measure of auditory gating, correlates with the cortical silent period, suggesting a role for GABA-B receptors in schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Neurophysiology
Background:
- Deficient inhibitory neurotransmission is implicated in schizophrenia.
- Electrophysiological (P50 suppression) and transcranial magnetic stimulation (TMS) paradigms (short-interval cortical inhibition, cortical silent period) assess inhibition.
- The relationship between these inhibitory measures is not well understood.
Purpose of the Study:
- To investigate the relationship between P50 suppression, short-interval cortical inhibition, and the cortical silent period in healthy individuals.
- To explore the potential role of gamma-aminobutyric acid (GABA) neurotransmission in coordinating these inhibitory processes.
Main Methods:
- Utilized previously published methods to assess P50 suppression in 21 healthy participants.
- Employed transcranial magnetic stimulation to measure short-interval cortical inhibition and the cortical silent period.
- Correlational analyses were performed to examine relationships between the measures.
Main Results:
- A significant negative correlation was found between P50 suppression and the cortical silent period (r=-0.49, P=0.02).
- No significant correlation was observed between P50 suppression and short-interval cortical inhibition.
- These findings suggest distinct but related inhibitory mechanisms.
Conclusions:
- P50 suppression and the cortical silent period are related, potentially mediated by gamma-aminobutyric acid B (GABA-B) receptor function.
- These results underscore the importance of GABA-B receptor-mediated neurotransmission in the neurobiology of schizophrenia.
- Further research is warranted to elucidate the specific roles of inhibitory neurotransmission in schizophrenia pathophysiology.
