23 documents found, page 1 of 3
Developing a dynamic virtual stimulation protocol to induce linear egomotion du...
Da-Silva,Paulo José Guimarães; Cagy,Maurício; Infantosi,Antonio Fernando CatelliAbstract Introduction In this work, the effect of a dynamic visual stimulation (DS) protocol was used to induce egomotion, the center of pressure (COP) displacement response. Methods DS was developed concerning the scenario structure (chessboard-pattern floor and furniture) and luminance. To move the scenario in a discrete forward (or backward) direction, the furniture is expanded (or reduced) and the black and...
EEG changes during sequences of visual and kinesthetic motor imagery
Stecklow,Marcus Vinicius; Infantosi,Antonio Fernando Catelli; Cagy,MaurícioThe evoked cerebral electric response when sequences of complex motor imagery (MI) task are executed several times is still unclear. This work aims at investigating the existence of habituation in the cortical response, more specifically in the alpha band peak of parietal and occipital areas (10-20 international system electroencephalogram, EEG, protocol). The EEG signals were acquired during sequences of MI of...
Regulation of negative emotions in high trait anxious individuals: an ERP study
Mocaiber,Izabela; Pereira,Mirtes Garcia; Erthal,Fátima Smith; Figueira,Ivan; Machado-Pinheiro,Walter; Cagy,Maurício; Volchan,Eliane; Oliveira,Letícia deLiterature has shown that failures in the ability to down-regulate negative emotions are the core substrate of anxiety disorders. Previous studies have investigated this issue by encouraging individuals to voluntarily change how they think about a situation in order to decrease its emotional impact. The majority of studies has demonstrated that explicit instructions to reduce negative affect in anxious individu...
Effects of a cognitive modulator in the theta and alpha asymmetry during a type...
Cunha,Marlo; Machado,Sergio; Miana,Luiz Cláudio; Machado,Dionis; Bastos,Victor Hugo; Velasques,Bruna; Cagy,Maurício; Basile,Luis F.; Piedade,RobertoThis study aimed to elucidate cortical mechanisms and to identify the areas where occur such mechanisms due to interaction between bromazepam and motor learning. The sample was composed of 45 healthy subjects randomly distributed in 3 groups: placebo (n=15), bromazepam 3 mg (n=15) or bromazepam 6 mg (n=15). To perform the experimental task, subjects sat comfortably at a distance of approximately 20 cm from the ...
Alzheimer's disease and implicit memory
Machado,Sergio; Cunha,Marlo; Minc,Daniel; Portella,Claudio Elidio; Velasques,Bruna; Basile,Luis F.; Cagy,Maurício; Piedade,Roberto; Ribeiro,PedroSpecific neuropsychiatric disorders, such as Alzheimer's disease (AD) affect some forms of memory while leaving others relatively intact. In this review, we investigate particularities of the relationship between explicit and implicit memories in AD. It was found that implicit memory is preserved in AD, irrespective of the task used; in other words, there was not interference from explicit memory. In addition, ...
Influence of bromazepam on cortical interhemispheric coherence
Sampaio,Isabel; Puga,Fernanda; Veiga,Heloisa; Cagy,Maurício; Piedade,Roberto; Ribeiro,PedroBenzodiazepines are among the most commonly prescribed medications due to their therapeutic efficacy in reducing anxiety and inducing sleep. Consequently, they have been widely employed in the pharmacological treatment of several disorders. Nevertheless, few studies have analyzed the effects of bromazepam in electroencephalographic activity (EEG). The present study aimed at investigating the modulatory effects ...
Alterações na coerência cortical inter-hemisférica produzidas pela estimulação ...
Ecard,Letícia; Silva,Andressa Pitanga S. da; Peçanha Neto,Marijose; Cagy,Maurício; Piedade,Roberto; Ribeiro,PedroO presente estudo teve como objetivo observar alterações corticais produzidas pela estimulação elétrica funcional (FES), através da eletrencefalografia quantitativa (EEGq). Simultaneamente à captação do sinal eletrencefalográfico, realizou-se uma eletroestimulação no antebraço direito para estimulação da extensão do indicador. A amostra consistiu de 45 sujeitos randomizados em 3 grupos de 15. O grupo controle f...
Memória de procedimentos e SPECT cerebral: avaliação de fluxo sanguíneo cerebel...
Silva,Márcia Thereza; Piedade,Roberto; Ribeiro,Pedro; Fonseca,Léa Mirian B. da; Pellini,Marcos Pinto; Cagy,MaurícioO objetivo deste estudo foi avaliar o fluxo sanguíneo cerebral no córtex cerebelar (4 sub-regiões) e no córtex pré-frontal, em repouso e durante uma tarefa motora. A amostra foi composta por 8 sujeitos saudáveis, ambos os sexos, entre 23 e 36 anos. O grupo foi submetido a tarefa visuo-motora (memória implícita) que consistia na ação de desviar um submarino de supostas minas que percorriam a tela do monitor. Par...
Os efeitos da estimulação elétrica funcional na assimetria cortical inter-hemis...
Ecard,Letícia; Silva,Andressa Pitanga S. da; Peçanha Neto,Marijose; Veiga,Heloisa; Cagy,Maurício; Piedade,Roberto; Ribeiro,PedroO objetivo do presente estudo foi avaliar os efeitos da estimulação elétrica funcional na assimetria cortical inter-hemisférica. Para tal, simultaneamente ao registro da atividade eletroencefalográfica, realizou-se eletroestimulação no antebraço direito para estimulação da extensão do indicador. A amostra consistiu de 45 sujeitos randomizados em 3 grupos de 15 sujeitos cada: grupo controle (submetido a 24 bloco...
The effects of bromazepam on the early stage of visual information processing (...
Puga,Fernanda; Sampaio,Isabel; Veiga,Heloisa; Ferreira,Camila; Cagy,Maurício; Piedade,Roberto; Ribeiro,PedroThe early stages of visual information processing, involving the detection and perception of simple visual stimuli, have been demonstrated to be sensitive to psychotropic agents. The present study investigated the effects of an acute dose of bromazepam (3 mg), compared with placebo, on the P100 component of the visual evoked potential and reaction time. The sample, consisting of 14 healthy subjects (6 male and ...