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Hemispheric differences in frontal theta-band power discriminate between stimulus-versus memory-driven saccadic eye movement

Published online by Cambridge University Press:  16 April 2020

B. Velasques ,
S. Machado ,
M. Cunha ,
J.L. Santos ,
J. Bittencourt ,
H. Budde ,
L.F. Basile ,
M. Cagy ,
R. Piedade  and
A.T. Sack
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B. Velasques
Affiliation:
Federal University of Rio de Janeiro, Brazil Institute of Applied Neuroscience, Rio de Janeiro, Brazil
S. Machado
Affiliation:
Federal University of Rio de Janeiro, Brazil
M. Cunha
Affiliation:
Federal University of Rio de Janeiro, Brazil
J.L. Santos
Affiliation:
Federal University of Rio de Janeiro, Brazil
J. Bittencourt
Affiliation:
Federal University of Rio de Janeiro, Brazil
H. Budde
Affiliation:
Universität zu Berlin, Humboldt, Germany
L.F. Basile
Affiliation:
University of São Paulo Medical School, Brazil UMESP, São Paulo, Brazil
M. Cagy
Affiliation:
Federal Fluminense University, Rio de Janeiro, Brazil
R. Piedade
Affiliation:
Federal University of Rio de Janeiro, Brazil
A.T. Sack
Affiliation:
Maastricht University, Maastricht, Netherlands Antilles
E. Cheniaux
Affiliation:
Federal University of Rio de Janeiro, Brazil
A.E. Nardi
Affiliation:
Federal University of Rio de Janeiro, Brazil
P. Ribeiro
Affiliation:
Federal University of Rio de Janeiro, Brazil

Abstract

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Introduction

Although several electrophysiological studies have demonstrated the role of theta band during the execution of different visuospatial attention tasks, this study is the first to directly investigate the role of theta power during the planning, execution and cognitive control of SEM.

Objective

Saccadic eye movements (SEMs) represent the first stage of visual sensorimotor integration and are relevant for the visuospatial attention. The current study aims to address this issue by investigating absolute theta power over the frontal cortex during the execution of stimulus- and memory-driven SEMs.

Methods

12 healthy volunteers (3 male; mean age: 26.25), performed two tasks involving different conditions in the planning, execution and cognitive control of SEMs while their brain activity pattern is recorded using quantitative electroencephalography.

Results

We found an interaction between SEM condition (memory- vs stimulus-driven) and electrode (F3, F4, Fz), and a main effect of time point and electrode. Our key finding revealed that the stimulus presentation induces different patterns over frontal theta power increase between the left and right hemisphere.

Conclusions

We conclude that right and left frontal regions are an important factor to discriminate between memory- versus stimulus-driven SEMs, and speculate on their role for different levels within the visuospatial attention.

Type
P01-433
Information
European Psychiatry , Volume 26 , Issue S2: Abstracts of the 19th European Congress of Psychiatry , March 2011 , pp. 437
Copyright
Copyright © European Psychiatric Association2011
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