-Specific 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, it was verified that is possible through implicit memory compensatory strategies such as, activities of daily living (ADL) to compensate for the explicit memory deficits. In this sense, cognitive rehabilitation (CR) demonstrates reasonable results in the process of compensation of explicit memory deficits. Concluding, the decline in explicit memory suggests that both systems are functionally independent even if the other is compromised. We expect that when explicit memory system is not involved in competition with the implicit system, the final effect of learning is better, because all of the implicit memory capacity is engaged in learning and not in competition with the explicit system. Key WoRDS: activities of daily living, Alzheimer's disease, cognitive rehabilitation, implicit memory. Doença de Alzheimer e memória implícitaResumo -Distúrbios neuropsiquiátricos específicos, tais como a doença de Alzheimer (DA), podem afetar algumas formas de memória enquanto deixam outros relativamente intactos. Nesta revisão, nós investigamos particularidades da relação entre as memórias explicita e implícita na DA. Foi verificado que a memória é preservada na DA, independente da tarefa usada; ou seja, não ocorre interferência da memória explícita. Além disso, foi verificado que é possível através de estratégias compensatórias de memória implícita, tais como, atividades da vida diária (AVD) compensar os déficits da memória explícita. Neste sentido, a reabilitação cognitiva (RC) demonstra resultados razoáveis no processo de compensação dos déficits da memória explicita. Concluindo, a queda na memória explícita sugere que ambos os sistemas são funcionalmente independentes mesmo que outro esteja comprometido. esperamos que quando o sistema de memória explícita não está envolvido em competição com o sistema implícito, o efeito final de aprendizagem é melhor, porque toda a capacidade da memória implícita está engajada na aprendizagem e não na competição com o sistema explícito. PALAVRAS-ChAVe: atividades da vida diária, doença de Alzheimer, memória implícita, reabilitação cognitiva.
The brain is capable of elaborating and executing different stages of information processing. However, exactly how these stages are processed in the brain remains largely unknown. This study aimed to analyze the possible correlation between early and late stages of information processing by assessing the latency to, and amplitude of, early and late event-related potential (ERP) components, including P200, N200, premotor potential (PMP) and P300, in healthy participants in the context of a visual oddball paradigm. We found a moderate positive correlation among the latency of P200 (electrode O2), N200 (electrode O2), PMP (electrode C3), P300 (electrode PZ) and the reaction time (RT). In addition, moderate negative correlation between the amplitude of P200 and the latencies of N200 (electrode O2), PMP (electrode C3), P300 (electrode PZ) was found. Therefore, we propose that if the secondary processing of visual input (P200 latency) occurs faster, the following will also happen sooner: discrimination and classification process of this input (N200 latency), motor response processing (PMP latency), reorganization of attention and working memory update (P300 latency), and RT. N200, PMP, and P300 latencies are also anticipated when higher activation level of occipital areas involved in the secondary processing of visual input rise (P200 amplitude).
RESUMO -O objetivo do presente estudo foi avaliar parâmetros atencionais, motores e eletre n c e f a l o g r á f i c o s durante uma tarefa de procedimentos em sujeitos que ingeriram 6mg de bromazepam. A amostra consistiu de 26 sujeitos saudáveis, ambos os sexos, entre 19 e 36 anos. Os grupos controle e experimental foram submetidos à tarefa datilográfica em desenho duplo-cego randomizado. Os achados não revelaram difere n ç a s nas medidas atencionais e motoras entre os grupos. Foram avaliadas medidas de coerência (EEGq) entre regiões do escalpo nas bandas teta, alfa e beta. Análise inicial revelou um efeito principal para condição (Anova 2-critérios de variação -condição versus blocos). Uma segunda Anova, também com 2 critérios de variação (condição versus região do escalpo), demonstrou um efeito principal para ambos os fatores. Em conclusão, a medida de coerência parece não ser uma ferramenta sensível para demonstrar diferenças entre á reas corticais em função de uma tarefa de pro c e d i m e n t o s .PALAVRAS-CHAVE: mapeamento cerebral, EEGq, coerência, treino motor, ansiolíticos.P rocedural learning and anxiolytic effects: electroencephalographic, motor and attentional measure s ABSTRACT -The objective of the present study was to evaluate attentional, motor and electro e n c e p h a l o g r a p h i c (EEG) parameters during a procedural task when subjects have ingested 6mg of bromazepam. The sample consisted of 26 healthy subjects, male or female, between 19 and 36 years of age. The control (placebo) and experimental (bromazepam 6mg) groups were submitted to a typewriting task in a randomized, double-blind design. The findings did not show significant diff e rences in attentional and motor measures between gro u p s . C o h e rence measures (qEEG) were evaluated between scalp regions, in theta, alpha and beta bands. A first analysis revealed a main effect for condition (Anova-2way -condition versus blocks). A second Anova 2-way (condition versus scalp regions) showed a main effect for both factors. The coherence measure was not a sensitive tool at demonstrating diff e rences between cortical areas as a function of procedural learn i n g . KEY WORDS: brain mapping, qEEG, coherence, motor tranning, motor sensory integration, anxiolitics. algumas patologias. Neste contexto, variáveis eletrencefalográficas vêm sendo analisadas em função da sua estreita relação com processos de aprendizagem motora. Em especial, a medida de coerência pa-A memória de procedimentos tem sido foco de investigações diversas. Ao longo dos anos torn o u -s e vital o entendimento deste tipo de memória em função da associação direta com tarefas do cotidiano e
-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-
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