Cortical asymmetry: catching an object in free fall

Velasques, Bruna; Machado, Sérgio; Portella, Cláudio Elidio; Silva, Julio Guilherme; Terra, Patrícia; Ferreira, Camila; Basile, Luis; Cagy, Maurício; Piedade, Roberto; Ribeiro, Pedro

doi:10.1590/s0004-282x2007000400015

Cited by 6 publications

(5 citation statements)

References 37 publications

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“…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).…”

Section: Discussionmentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…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] .…”

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confidence: 99%

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

Teixeira

Velasques

Machado

et al. 2011

Arq. Neuro-Psiquiatr.

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This study aimed to elucidate cortical mechanisms involved in anticipatory actions when 23 healthy right-handed subjects had to catch a free falling object through quantitative electroencephalogram (qEEG). For this reason, we used coherence that represents a measurement of linear covariation between two signals in the frequency domain. In addition, we investigated gamma-band (30-100 Hz) activity that is related to cognitive and somatosensory processes. We hypothesized that gamma coherence will be increase in both parietal and occipital areas during moment after ball drop, due to their involvement in manipulation of objects, visuospatial processing, visual perception, stimuli identification and attention processes. We confirmed our hypothesis, an increase in gamma coherence on P3-P4 (t= -2.15; p=0.033) and PZ-OZ (t= -2.16; p=0.034) electrode pairs was verified for a paired t-test. We conclude that to execute tasks involving anticipatory movements (feedforward mechanisms), like our own task, probably, there is no need of a strong participation of visual areas in the process of information organization to manipulate objects and to process visuospatial information regarding the contact hand-object. Key words: catching, coherence, gamma, qEEG, sensorimotor integration.Oscilações na banda gama em áreas parieto-occipitais durante desempenho de uma tarefa sensório-motora: um estudo de coerência na EEGq RESUMO Este estudo teve como objetivo elucidar os mecanismos corticais envolvidos em ações antecipatórias quando 23 indivíduos saudáveis destros tinham que apreender um objeto em queda livre, através da eletroencefalografia quantitativa (EEGq). Por esta razão, usamos a coerência que representa a covariação linear entre dois sinais no domínio da frequência. Além disso, investigamos a atividade da banda gama (30-100 Hz), que está relacionada à processos cognitivos e somato-sensoriais. Nossa hipótese é que a coerência de gama estará aumentada em ambas as áreas parietais e occipitais durante o momento pós-queda da bola, devido ao seu envolvimento na manipulação de objetos,

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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

Teixeira

Velasques

Machado

et al. 2011

Arq. Neuro-Psiquiatr.

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“…Four regions of interest were selected: the pre-motor and pre-frontal cortex, represented by the F3/F4, F3/Fz and F7/Fz derivations, which are functionally responsible for action creation and voluntary control [ 24 ] and for executive functions [ 25 ]; the C3/Cz, C3/C4 and C4/Cz derivations for being representatives of primary motor areas related to the motor act execution [ 26 ]; the P3/Pz and P3/P4 derivations, due to their relationship with sensorimotor integration [ 2 , 23 , 32 ] and the secondary motor areas, represented by the T3/T4 derivations. For such analysis, theta band (4–7 Hz) was used, and it was chosen because of its association to cognitive functions, such as sensory information codification [ 33 ], attention mechanisms [ 34 ] and multi-sensory information transmission [ 13 ].…”

Section: Methodsmentioning

confidence: 99%

Changes in the theta band coherence during motor task after hand immobilization

Brauns¹,

Teixeira²,

Velasques³

et al. 2014

Int Arch Med

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Many different factors can temporarily or permanently impair movement and impairs cortical organization, e.g. hand immobilization. Such changes have been widely studied using electroencephalography. Within this context, we have investigated the immobilization effects through the theta band coherence analysis, in order to find out whether the immobilization period causes any changes in the inter and intra-hemispheric coherence within the cerebral cortex, as well as to observe whether the theta band provides any information about the neural mechanisms involved during the motor act. We analyzed the cortical changes that occurred after 48 hours of hand immobilization. The theta band coherence was study through electroencephalography in 30 healthy subjects, divided into two groups (control and experimental). Within both groups, the subjects executed a task involving flexion and extension of the index finger, before and after 48 hours. The experimental group, however, was actually submitted to hand immobilization. We were able to observe an increase in the coupling within the experimental group in the frontal, parietal and temporal regions, and a decrease in the motor area. In order to execute manual tasks after some time of movement restriction, greater coherence is present in areas related to attention, movement preparation and sensorimotor integration processes. These results may contribute to a detailed assessment of involved neurophysiological mechanism in motor act execution.

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“…De manera similar, los sujetos pudieron explorar también la información visual disponible en el breve período transcurrido desde el inicio de la caída de la bola. Tal exigencia sensorial se volvería menos activa en el momento posterior a la caída, lo cual se relaciona con la ejecución motora propiamente dicha, es decir, con el movimiento de la mano para coger la bola.En resumen, la unión parietooccipital derecha se asociaría al aumento de expectativa y prontitud procedente de la anticipación de una tarea, tal como afirmaron Velasques et al[30]. De esta manera, concluimos que nuestros hallazgos indican una fuerte implicación de la corteza parietooccipital derecha con el aumento de la expectativa y la prontitud en los procesos preparatorios de una tarea motora.…”

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