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

B. Velasques*, S. Machado, F. Paes, J. Bittencourt, C. A. Domingues, L.F. Basile, J.I. Salles, M. Cagy, R. Piedade, O. Arias-Carrion, A.T. Sack, E. Cheniaux, A.E. Nardi, P. Ribeiro

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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 saccadic eye movements (SEMs). The current study aims at addressing this issue by investigating absolute theta power over the frontal cortex during the execution of random and fixed SEMs. Twelve healthy volunteers, performed two tasks involving different conditions in the planning, execution and cognitive control of SEMs while their brain activity pattern was recorded using quantitative electroencephalography. We found an interaction between SEM condition 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. We conclude that right and left frontal regions are an important factor to discriminate between memory- versus stimulus-driven SEMs, and speculate on their different contributions to visuospatial attention. 

Original languageEnglish
Pages (from-to)204-208
Number of pages5
JournalNeuroscience Letters
Volume504
Issue number3
DOIs
Publication statusPublished - 31 Oct 2011

Keywords

  • Absolute theta power
  • Saccadic eye movement
  • Attention process
  • qEEG
  • Sensorimotor integration
  • DORSOLATERAL PREFRONTAL CORTEX
  • OCULAR MOTOR BEHAVIOR
  • SENSORIMOTOR INTEGRATION
  • CINGULATE CORTEX
  • ATTENTION
  • OSCILLATIONS
  • NEUROANATOMY
  • NAVIGATION
  • SYSTEMS
  • SHIFTS

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