Relation Between Task-related Activity Modulation and Cortical Inhibitory Function in Schizophrenia and Healthy Controls: a TMS-EEG Study

Overview

Journal Eur Arch Psychiatry Clin Neurosci

Specialties Neurology
Psychiatry

Date 2024 Jan 19

PMID 38243018

Authors

Ines Fernandez-Linsenbarth

Gema Mijancos-Martinez

Alejandro Bachiller

Pablo Nunez

Victor Rodriguez-Gonzalez

Rosa M Beno-Ruiz-de-la-Sierra

Alejandro Roig-Herrero

Antonio Arjona-Valladares

Jesus Poza

Miguel Angel Mananas

Vicente Molina

Affiliations

Soon will be listed here.

Abstract

Schizophrenia has been associated with a reduced task-related modulation of cortical activity assessed through electroencephalography (EEG). However, to the best of our knowledge, no study so far has assessed the underpinnings of this decreased EEG modulation in schizophrenia. A possible substrate of these findings could be a decreased inhibitory function, a replicated finding in the field. In this pilot study, our aim was to explore the association between EEG modulation during a cognitive task and the inhibitory system function in vivo in a sample including healthy controls and patients with schizophrenia. We hypothesized that the replicated decreased task-related activity modulation during a cognitive task in schizophrenia would be related to a hypofunction of the inhibitory system. For this purpose, 27 healthy controls and 22 patients with schizophrenia (including 13 first episodes) performed a 3-condition auditory oddball task from which the spectral entropy modulation was calculated. In addition, cortical reactivity-as an index of the inhibitory function-was assessed by the administration of 75 monophasic transcranial magnetic stimulation single pulses over the left dorsolateral prefrontal cortex. Our results replicated the task-related cortical activity modulation deficit in schizophrenia patients. Moreover, schizophrenia patients showed higher cortical reactivity following transcranial magnetic stimulation single pulses over the left dorsolateral prefrontal cortex compared to healthy controls. Cortical reactivity was inversely associated with EEG modulation, supporting the idea that a hypofunction of the inhibitory system could hamper the task-related modulation of EEG activity.

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