Rationale Alterations in brainstem circuits have been proposed as a possible mechanism underlying the etiology of mood disorders. Projections from the median raphe nucleus (MnR) modulate dopaminergic activity in the forebrain and are also part of a behavioral disinhibition/inhibition system that produces phenotypes resembling behavioral variations manifested during manic and depressive phases of bipolar disorder. Objective Assess the effect of chronic lithium treatment on behavioral disinhibition induced by MnR lesions. Methods MnR electrolytic lesions were performed in C57BL/6J mice, with sham operated and intact animals as control groups. Following recovery, mice were chronically treated with lithium (LiCl, added in chow) followed by behavioral testing. Results MnR lesion induced manic-like behavioral alterations including hyperactivity in the open field (OF), stereotyped circling, anxiolytic/risk taking in the elevated plus maze (EPM) and light/dark box (LDB) tests, and increased basal body temperature. Lithium was specifically effective in reducing OF hyperactivity and stereotypy but did not reverse (EPM) or had a nonspecific effect (LDB) on anxiety/risk taking measures. Additionally, lithium decreased saccharin preference and prevented weight loss during single housing. Conclusions Our data support electrolytic lesions of the MnR as an experimental model of a hyper-excitable/disinhibited phenotype consistent with some aspects of mania that are attenuated by the mood stabilizer lithium. Given lithium’s relatively specific efficacy in treating mania, these data support the hypothesis that manic symptoms derive not only from the stimulation of excitatory systems but also from inactivation or decreased activity of inhibitory mechanisms.
This theoretical interpretive essay aims to provide a radical behaviorist analysis of operational and ethical aspects of the Brazilian "jeitinho." It can be defined as a behavioral variability shown and maintained by the Brazilians in a context of historical material deprivation as well as governmental and social control. The same behavioral pattern was observed during the first efforts of starting behavior analysis in Brazil. In the 1960s, Professor Keller and his Brazilian colleagues from the University of São Paulo made operant conditioning chambers by hand using improvised items (i.e., birdcages and lunchboxes). We have located some of those first Brazilian conditioning chambers and photo-documented them to use as an illustration of the cultural practice in analysis-combining a double interest that integrates a cultural analysis and a description of the history of the science of behavior in the country.
Estratégias terapêuticas descritas como eficazes em transtornos de ansiedade envolvem procedimentos comportamentais e cognitivo-comportamentais de exposição a enfrentamento de situações aversivas. Entretanto, considerando-se que o padrão comportamental comum a estes transtornos é a esquiva fóbica, o uso de tais estratégias pode dificultar a adesão ou promover fuga/esquiva do e no processo terapêutico. A Psicoterapia Analítica Funcional surge como alternativa para manejo dos comportamentos de esquiva e para promoção de respostas de enfrentamento. Este estudo apresenta a análise da relação terapêutica de um caso de Transtorno de Pânico com Agorafobia. A intervenção baseada na FAP foi adotada para auxiliar no manejo do padrão de esquiva do processo terapêutico apresentado pela cliente. Os resultados demonstram a efetividade dos procedimentos adotados e confirmam a possibilidade de utilização da FAP para aumento da eficácia de terapias empiricamente baseadas.
A lesão do núcleo mediano da rafe (NMR) produz sintomas que sugerem validade de face ao episódio maníaco. Esta pesquisa avaliou o efeito do lítio sobre a hiperatividade locomotora induzida por esta lesão. Vinte e um ratos Wistar machos foram submetidos à lesão eletrolítica da região do NMR (LR) e 17 foram submetidos à lesão fictícia (LF). Após recuperação, a atividade locomotora foi avaliada na caixa de atividade (Med Associates/ENV-515). Parte dos animais destes grupos recebeu tratamentos com lítio (47,5 mg/kg/2x dia i.p.) por 10 dias, enquanto o restante foi tratado com salina no mesmo esquema. A reavaliação ao final dos tratamentos demonstrou que o lítio reduziu significantemente a atividade locomotora em relação à avaliação inicial no grupo LR (ANOVA/Bonferroni p < 0,05), tornando-a equivalente aos baixos níveis dos grupos LF. Estes dados sustentam a hipótese de que as manifestações induzidas pela lesão do NMR podem constituir um modelo animal de mania.
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