Estudo preliminar sobre o impacto da estimulação transcraniana por corrente contínua em tarefa de multiplicação

• Ano de defesa: 2009
• Autor(a) principal: Picinini, Rita dos Santos de Carvalho
• Orientador(a): Boggio, Paulo Sérgio
• Banca de defesa: Macedo, Elizeu Coutinho de , Bueno, Orlando Francisco Amodeo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Presbiteriana Mackenzie
• Programa de Pós-Graduação: Distúrbios do Desenvolvimento
• Departamento: Psicologia
• País: BR
• Palavras-chave em Português: Estimulação Transcraniana por Corrente Contínua (ETCC); operação de multiplicação; Córtex Pré-Frontal Dorsolateral Esquerdo (CPFDLE); Córtex Parietal Direito (CPD); Córtex Parietal Esquerdo (CPE); discalculia
• Palavras-chave em Inglês: Transcranial Direct Current Stimulation (TDCS); multiplication; Left Dorsolateral Pre-Frontal Cortex (LDLPFC); Right Parietal Cortex (RPC); Left Parietal Cortex (LPC); dyscalculia
• Área do conhecimento CNPq: CNPQ::CIENCIAS HUMANAS::PSICOLOGIA
• Link de acesso: http://dspace.mackenzie.br/handle/10899/22643

Different mathematical skills have been investigated over time and, with the advance of neuroimaging techniques, such as PET (Positron Emission Tomography) and fMRI (functional Magnetic Resonance), central components of arithmetical processing have been identified in the parietal and the pre-frontal cortices. Besides the advances of the neuroimaging techniques, other techniques such as non-invasive brain modulation have also been studied such as the transcranial magnetic stimulation (TMS) and the transcranial direct current stimulation (TDCS) in the involvement of cognitive functions in the area of calculation. This study aimed at investigating the impact of anodal TDCS applied over the left dorsolateral pre-frontal cortex (LDLPFC), right parietal cortex (RPC), left parietal cortex (LPC) while the subject was performing multiplication operations. Fifteen healthy volunteers, students of psychology, aged between 18 and 30 years old, have held subtests of the WAIS III and the multiplication task. The results showed that the anodal TDCS over the RPC improved the performance of men regarding the number of rightness. The influence of TDCS on volunteers who had worse performance took place not on complex tasks, but simple arithmetical ones. Besides, the influence of TDCS on volunteers who had better performance was in complex tasks, not simple ones. These results show that the effects of the TDCS on a certain function depend on the baseline values of each volunteer. The other stimulation conditions over the LDLPFC and LPC did not show any significant results. The TDCS can bring a beneficial effect in calculation tasks, depending on the intensity, polarity, time and location of stimulation, resulting in the increased or diminished cortex excitability.