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EEG correlates of impaired anticipation processes in the early stages of schizophrenia

Published online by Cambridge University Press:  01 September 2022

M. Slavutskaya ,
I. Lebedeva ,
M. Omelchenko ,
E. Abdullina  and
S. Karelin
M. Slavutskaya
Affiliation:
Mental Health Research Center, Laboratory Of Neuroimaging And Multimodal Analysis, Moscow, Russian Federation Lomonosov Moscow State University, Department Of The Highest Nervous Activity, Moscow, Russian Federation
I. Lebedeva
Affiliation:
Mental Health Research Center, Laboratory Of Neuroimaging And Multimodal Analysis, Moscow, Russian Federation
M. Omelchenko
Affiliation:
Mental Health Research Center, Department Of Youth Psychiatry, Moscow, Russian Federation
E. Abdullina*
Affiliation:
Mental Health Research Center, Laboratory Of Neuroimaging And Multimodal Analysis, Moscow, Russian Federation
S. Karelin
Affiliation:
Lomonosov Moscow State University, Department Of The Highest Nervous Activity, Moscow, Russian Federation
*
*Corresponding author.

Abstract

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Introduction

An impairment of anticipation processes is considered as a common deficiency in schizophrenia (Kveraga et al., 2007), however its neural mechanisms remain poorly understood.

Objectives

The aim of the study was to analyze CNV-like slow negative waves during the pre-target stimuli waiting period in patients with the first episode of the disease.

Methods

32-channels EEGs during “Go / No go delay” saccadic paradigm have been recorded in 16 young male patients with illness duration less than 2 years and 18 age and sex matched healthy subjects. The delay period between fixation and target (“Go” or “No go”) visual stimulus was 2800-3000 ms. The early and late components of CNV - like slow negative waves (PMN1 and 2) have been studied in 1 sec pre-stimulus interval of delay period.

Results

As compared to norm, the patients showed significantly increased latencies of saccades to correctly discriminated stimuli and higher percent of “errors saccades”. The amplitudes of No go-PMN1 and Go-PMN2 waves were also increased in patients. The amplitude foci of these waves were diffusely distributed in patients and mostly localized in frontal leads in norm.

Conclusions

The findings assume some violation of anticipation for action (motor or inhibitory response) processes as well as an increase of presumably cortical activation during stimulus anticipation in the “Go/No go delay” saccadic paradigm in the early stage of schizophrenia.

Disclosure

No significant relationships.

Keywords

go/no-go delay paradigmanticipationsaccadeslow waves
Type
Abstract
Information
European Psychiatry , Volume 65 , Special Issue S1: Abstracts of the 30th European Congress of Psychiatry , June 2022 , pp. S315 - S316
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the European Psychiatric Association
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