Detalhes bibliográficos
| Ano de defesa: |
2021 |
| Autor(a) principal: |
Solano, Gilberto do Carmo |
| Orientador(a): |
Basile, Luis Fernando Hindi |
| Banca de defesa: |
Rezende , Manoel Morgado,
Serafim , Antônio de Pádua,
Alvarenga , Milkes Yone,
Silva , Alair Pedro Ribeiro de Souza e |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Metodista de Sao Paulo
|
| Programa de Pós-Graduação: |
Psicologia da Saude
|
| Departamento: |
Psicologia da Saude:Programa de Pos Graduacao em Psicologia da Saude
|
| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://tede.metodista.br/jspui/handle/tede/2094
|
Resumo: |
Introduction: The electroencephalographic neurofeedback is based on the monitoring and feedback of electrical brain activity, aiming at the learning of conscious control on the part of the individual, of aspects of the general functioning of the brain, changing the patterns of the electrical potentials of the cortex, so that there are conditioning frequency bands of the waves. Previous research has shown that the relationship between theta (4-8 Hz) and beta (13-30 Hz) oscillations on the electroencephalogram is associated with the learning of feedback linked to attention. An established training is for the Theta / Beta power ratio, which aims to improve a state of sustained attention, reinforcing reductions in theta amplitudes (4-8 Hz) and increase in Beta amplitudes (13-30 Hz). However, the neuronal mechanisms that mediate successful neurofeedback training have not yet been sufficiently elucidate. Objective: To verify whether the Theta / Beta ratio indicated by the neurofeedback device correlates with those obtained during performance in independently measurable attention tasks. Method: The sample consisted of 22 subjects aged between 21 and 63 years old. The data were recorded by Electroencephalogram (EEG) of four channels obtained during five conditions: LBase (rest), Neurofeedback Training (NFBK), Continuous Performance Task (CPT), d2R and Digit Symbol Substitution Teste (DSST). The EEG data were analyzed by amplitude in three frequency bands (Theta, Alpha and Beta) and the Teta / Beta ratio. Differences in EEG between conditions were analyzed using Friedman's nonparametric statistical test. Correlations were analyzed using Spearman's rank correlation coefficient. Results: Regarding the comparisons of NFBK and LBase, there was no reduction in the Theta / Beta ratio. Only the F3 electrode showed a difference, with an increase in the Theta / Beta ratio in DSST compared with rest and with d2R. In comparisons of Alpha in relation to the baseline (LBase), only in C4 there is a significant relationship between CPT and LBase, with CPT less than Lbase. In intra-individual correlations between TR and Theta / Beta ratio, only five of the twenty-two subjects in the sample showed significant correlations, but in opposite directions. There were no reductions in the theta / beta or alpha ratio in the correlations between the mean electrophysiological and behavioral variables between individuals. Discussion: The results achieved with this work do not corroborate previous studies, in which the Theta / Beta ratio is negatively related to attentive control, that is, an increased Theta and reduced Beta, observed during attention tasks. The results indicate that the NFBK did not alter or reduce the TBR. No consistent changes within the TBR session were found in the LBase measurement when compared to the 15-minute NFBK training measurement, suggesting that the NFBK did not induce any changes in the EEG measurements leading to a decrease in the TBR ratio. Conclusion: The findings of this study are at odds with what was expected, as there was no evidence that neurofeedback aimed at reducing the Theta / Beta ratio is effective in healthy participants. |
