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Premotor and occipital theta asymmetries as discriminators of memory- and stimulus-guided tasks |
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| Authors: | Cartier Consuelo Bittencourt Juliana Peressutti Caroline Machado Sergio Paes Flávia Sack Alexander T Basile Luis F Teixeira Silmar Salles José Inácio Nardi Antonio Egidio Cagy Mauricio Piedade Roberto Arias-Carrión Oscar Velasques Bruna Ribeiro Pedro |
| Affiliation: | a Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of the Federal University of Rio de Janeiro (IPUB/UFRJ), Brazil b Institute of Applied Neuroscience (IAN), Rio de Janeiro, Brazil c Division of Neurosurgery, University of São Paulo Medical School, Brazil d Laboratory of Psychophysiology, Department of Psychology and Phonoaudiology, UMESP, Brazil e Division of Epidemiology and Biostatistics, Institute of Health Community, Federal Fluminense University (UFF), Rio de Janeiro, Brazil f School of Physical Education, Bioscience Department (EEFD/UFRJ), Brazil g Panic & Respiration Laboratory, Institute of Psychiatry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil h Faculty of Psychology, Brazilian Institute of Medicine and Rehabilitation (IBMR), Rio de Janeiro, Brazil i National Institute of Translational Medicine (INCT-TM), Brazil j Department of Neurology, Phillips University Marburg, Marburg, Germany k Neuromuscular Research Laboratory, National Institute of Traumatology and Orthopaedics (NITO), Rio de Janeiro, Brazil l Neurophysiology and Neuropsychology of Attention, Institute of Psychiatry of the Federal University of Rio de Janeiro (IPUB/UFRJ), Brazil m Department of Cognitive Neuroscience, Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, The Netherlands |
| Abstract: | The saccadic paradigm has been used to investigate specific cortical networks involving visuospatial attention. We examined whether asymmetry in theta and beta band differentiates the role of the hemispheres during the execution of two different prosacadic conditions: a fixed condition, where the stimulus was presented at the same location; and a random condition, where the stimulus was unpredictable. Twelve healthy volunteers (3 male; mean age: 26.25) performed the task while their brain activity pattern was recorded using quantitative electroencephalography. We did not find any significant difference for beta, slow- and fast-alpha frequencies for the pairs of electrodes analyzed. The results for theta band showed a superiority of the left hemisphere in the frontal region when responding to the random condition on the right, which is related to the planning and selection of responses, and also a greater activation of the right hemisphere during the random condition, in the occipital region, related to the identification and recognition of patterns. These results indicate that asymmetries in the premotor area and the occipital cortex differentiate memory- and stimulus-driven tasks. |
| Keywords: | qEEG Saccadic eye movement Lateralization Visuospatial attention Sensorimotor integration |
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