24 research outputs found

    Temporary inactivation of the dorsal hippocampus induces a transient impairment in retrieval of aversive memory

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    The reconsolidation hypothesis, which predicts that consolidated memories become labile and sensitive to amnestic agents upon reactivation, has been one of the most debated topics in memory research over recent years. One of the main criticisms to this hypothesis is the fact that some studies have shown the effects of “reconsolidation blockade” to be transient. Here we show that muscimol inactivation of the dorsal hippocampus following memory reactivation produces a reversible impairment of step-down inhibitory avoidance memory in rats. Moreover, we show that the reversal of this effect is dependent on the passage of time, and not on repeated testing. The implications of the findings to the interpretation of the phenomenon of transient retrieval impairment induced by post-reactivation pharmacological interventions on memory systems are discussed

    Recentes avanços na neuroquímica da consolidação da memória e evocação: impacto na concepção atual dos distúrbios de memória

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    Submitted by Ilno Conceição ([email protected]) on 2012-11-22T00:56:51Z No. of bitstreams: 1 Recent advances in the neurochemistry of memory consolidation and retrieval impact on current views on memory disorders.pdf: 117846 bytes, checksum: 6b15d9c0405b1fb7bcab75e5b1b22734 (MD5)Approved for entry into archive by Michele Fernanda([email protected]) on 2012-11-25T00:56:32Z (GMT) No. of bitstreams: 1 Recent advances in the neurochemistry of memory consolidation and retrieval impact on current views on memory disorders.pdf: 117846 bytes, checksum: 6b15d9c0405b1fb7bcab75e5b1b22734 (MD5)Made available in DSpace on 2012-11-25T00:56:32Z (GMT). No. of bitstreams: 1 Recent advances in the neurochemistry of memory consolidation and retrieval impact on current views on memory disorders.pdf: 117846 bytes, checksum: 6b15d9c0405b1fb7bcab75e5b1b22734 (MD5) Previous issue date: 2005Many aspects of the molecular basis of declarative memory formation, retrieval and extinction have been established in the past few years. These aspects add to, and partly modify, some long-standing concepts on memory disorders. This article will review data from our laboratories and comment on their impact on these concepts. Particular emphasis will be placed on: a) new findings on the modulation of working memory; b) the separation of short- from long-term memory; c) the molecular pharmacology of memory retrieval.Nos últimos anos houve avanços substanciais no conhecimento dos mecanismos moleculares da aquisição, consolidação e evocação das memórias. Muitos desses avanços tem conseqüências importantes na compreensão e no tratamento dos diversos síndromes de déficit de memória (o déficit cognitivo que acontece com a idade avançada, as doenças degenerativas como o síndrome de Alzheimer, etc.). Discutiremos neste artigo os principais avanços na diagnóstico e terapêutica surgidos destes novos conhecimentos sobre a biologia dos processos mnemônicos
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