Efeitos do Bromazepam observados pela eletroencefalografia quantitativa (EEGq) durante a prática de datilografia

Abstract

Effects of Bromazepam in qEEG by typingwritingABSTRACT -The efficiency with which an information is processed by the brain's neural circuitry can be altered by neuromodulators. The use of Bromazepam in the pharmacological treatment of anxiety disorders is due to its anxiolytic property. However, the effects of this benzodiazepine in motor learning tasks are not entirely understood. In this context, the goal of this study was to assess the effects of Bromazepam ( 6 m g ) on psychophysiological, behavioral, and electrophysiological variables, during the process of learning a motor task. The sample consisted of 26 healthy individuals, of both sexes, between 19 and 36 years of age. The c o n t ro l (placebo) and experimental (Bromazepam 6 mg) groups were submitted to a typewriting task, in a randomized, doble-blind design. The results did not reveal diff e rences for phychophysiological and behavioral variables between the groups. Statistical tests pointed out to an interaction between condition and m o m e n t , and a hemisphere main effect, i.e. a reduction of relative power in the right hemisphere. This reduction s u g g e s t s a specialization of the neural circ u i t ry in the hemisphere contralateral to the finger used in the task. Such re d u c t i o n is independent from the drug administration.KEY WORDS: Bromazepam, qEEG, motor learning.Desde o nascimento, o ser humano vivencia p rocessos diversificados de aprendizagem. Inicialmente, ele aprende a andar e a falar, com o decorrer da vida, vai sendo submetido a aprendizagens cada v e z mais elaboradas 1 . Em termos gerais, pode ser dito que o indivíduo é predisposto a duas naturezas de a p rendizagem: intelectual (re f e rente ao pensamento) e motora (que diz respeito aos gestos corporais). E n t retanto, pensamentos e movimentos se i n t e g r a m constantemente na realização das intenções do sujeito, seja quando uma idéia necessita ser executada ou quando um gesto precisa ser planejado 2 . No or-

EEG spectral cohrence inter and intrahemispheric during catching object fall task

“…These experiments contribute to the comprehension of differences between times 1 and 3. In behavioral studies, a reduction in mistakes and execution time during typewriting is also observed 26 . These findings reinforce the hypothesis that the transition from block 1 to 2 seemed to match with some critical stage of learning; setting, perhaps, the evolution from a controlled processing stage (emphasizing on cognitive demands), toward advanced stages, such as automatism (predominantly motor demands).…”

Eficácia dos exercí­cios de Tai Chi Chuan na prevenção do risco de quedas em idosos

“…Estudos envolvendo a prática motora mostram que conforme a atividade é repetida ocorre melhoria nas variáveis comportamentais, ou seja, o sujeito executa a tarefa de maneira mais ágil e precisa. Alterações nestas variáveis sugerem aprendizagem e evidenciam alterações plásticas decorrentes da fi xação da tarefa motora [40][41]. Alguns autores, no intuito de verifi car quais componentes de um programa de exercícios são mais efi cazes na redução do risco de quedas, realizaram várias abordagens de tratamento variando em freqüência, intensidade e duração.…”

Movement automatization: motor interactions and electroencephalogram application

“…Beta is considered a fast wave frequency (12 to 30 Hz) and appears to be the one that is most related to motor activities, both premotors and motor itself, having value for analyses related to normal and pathological movements. The theta frequency band is associated with automatism and attention processes, as well as being important for a variety of cognitive functions [11,12].…”