Interface cérebro computador por potencial evocado visual de regime permanente baseada em coerência múltipla e teste F normalizado

Detalhes bibliográficos
Ano de defesa: 2018
Autor(a) principal: D’Affonsêca Netto, Aluizio
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Biomédica
UFRJ
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/11422/12048
Resumo: Brain Computer Interfaces (BCI) are systems that are capable of translating information from the neuronal activity of a subject into controlling signals for external devices to be used for communication and motor impairment rehabilitation. The active interface developed here uses evoked potentials of periodic sensory stimulation, such as intermittent photic stimulation, which exhibits reduced complexity and processing time in comparison with passive interfaces. In this BCI, online detectors are used, such as, multiple magnitude square coherence (MMSC) and normalized local F-test (TFLN), whose detection is based on statistical thresholds in order to increase sensitivity and specificity of the decision system and reduce response time. The proposed system has four sets of LEDs (Light Emission Diode) arranged on the edges of an LCD monitor, each of which blinking at a different frequency. The evoked response detected on 8 lead EEG signals is used to move a cursor on up, down, left, and right directions as the subject gazes one of the LEDs. The results of the use of the system with fifteen volunteers indicate that it is capable of detecting responses with a delay of 5.66 s for MMSC and 1.38 s for TFLN. The accuracy obtained in the tests allows application of the developed techniques in practice BCIs, in particular, the TFLN allows comparison of responses and low sensibility for phase deviations in the stimulation signal.