Changes in quantitative EEG absolute power during the task of catching an object in free fall

Abstract

-the aim of this study was to verify changes in absolute power (qEEG), in theta, during the catch of a free falling object. the sample consisted of 10 healthy individuals, of both genders, with ages between 25 and 40 years. A three-way ANOVA followed by Post-Hoc analysis was applied. the results demonstrated main effects for time and position. In conclusion, a motor task that involves expectation produces deactivation of non-relevant areas in the ipsilateral hemisphere of the active limb. On the other hand, the patterns of results showed activation in areas responsible for planning and selection of motor repertories in the contralateral hemisphere.Key wOrds: absolute power, qeeG, planning, sensorimotor integration.Mudanças na potência absoluta no EEG quantitativo durante tarefa de apreensão de um objeto em queda livre resumO -O objetivo deste estudo foi verificar mudanças na potência absoluta (EEGq), em teta, durante a pegada de objeto em queda livre. A amostra consistiu de 20 indivíduos saudáveis, de ambos os gêneros, com idade entre 25 e 40 anos. Foi utilizada uma ANOVA three-way seguida de uma análise Post-Hoc. Os resultados demonstraram efeito principal para momento e posição. concluindo, uma tarefa motora que envolve expectativa produz desativação de áreas não-relevantes no hemisfério ipsilateral do membro ativo. Por outro lado, o padrão dos resultados mostrou ativação em áreas responsáveis por planejamento e seleção de repertórios motores no hemisfério contralateral.PAlAvrAs-chAve: potência absoluta, eeGq, planejamento, integração sensório-motora. motor behavior is the product of a fine integration between cortical and peripheral components associated to afferent information. the central nervous system (cNs) captures, identifies and processes sensory stimuli in order to prepare and adjust motor behavior 1 . the prefrontal cortex (PFc) is an integration cortex. It is considered neither a sensory nor a motor cortex; it is an association region, providing integration sensory stimuli to motor centers 2,3 . the PFc is involved in cognition, attention maintenance, planning and organization, including the capacity to follow certain thought sequences and behavior strategy choices 4 . Plastic alterations might occur in this area regarding motor reactions (reaction time, anticipatory movements and motor learning), which might lead to performance and gesture precision improvement 5 . Quantitative electroencephalography (qEEG) has made possible the elucidation of cognitive processes and motor learning 6,7 . specific electroencephalographic variables are particularly related to such processes. Absolute power, defined as total energy intensity of an electrode on a certain region at different frequency bands 8 . therefore, the present study examined the theta band (4-7 hz), due to its relation with attention processes, particularly, sustained attention 9 . Previous experimental data showed an association between theta and cognitive and visual-

Gamma band oscillations in parietooccipital areas during performance of a sensorimotor integration task: a qEEG coherence study

“…In our task, subjects had to attend to an object (i.e., the ball) while prepared for catching it, requiring a visual guidance for hand movements which need a set of somatosensory inputs to control the movements, more specifically, the manipulation of the ball that involves the synchronous coordination of finger movements [14][15][16] . Besides, it is necessary adjusting the hand to the shape and to the fall line of the ball (i.e., posture and position of the hand related to the ball).…”

“…Such behavior is related to the activation and recruitment of cortical regions which participates in the sensorimotor integration process that gathers information coming from the environment and the performed motor task in order to prepare motor acts and to enhance the execution of goal-directed tasks [14][15][16] , e.g., catching an object. Thus, the cortical areas are recruited to promote a self-organization (i.e., the functional reorganization of circuits) of neural networks for the constitution of a functional group (binding problems) 17 to improve the coordination and the motor control due to the instability induced by the task [14][15][16] . Based on this assumption, our experiment investigated the coherence of the quantitative electroencephalogram (qEEG) in parietal and occipital regions in a catching task when participants have to catch a ball in free fall.…”

“…The experiment was approved by the Ethics Committee of Federal University of Rio de Janeiro (IPUB/UFRJ). This experimental paradigm has been already used in other experiment [14][15][16] .…”

Estratégia terapêutica após contusão da medula espinhal: recuperação funcional e estabilidade cortical sensório-motora

“…Na literatura está consolidado que logo após o trauma ocorre o choque medular (Nacimiento e Noth, 1999;Ditunno et al, 2004;Boland et al, 2011 A frequência theta está relacionada com os estados de alerta e atenção (MacKay, 2005;Machado et al, 2007;Baumeister et al, 2008;Kuo et al, 2010 relevantes para a organização da resposta motora (Cassim et al, 2001;MacKay, 2005;Kristeva et al, 2007;Lalo et al, 2007).…”

“…Já foi extensivamente mostrado que a frequência theta está relacionada com os estados de atenção, alerta e memória (Steriade, 2005;Machado et al, 2007;Baumeister et al, 2008;Sauseng e Klimesch, 2008;Kuo et al, 2010).…”