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SOBI with Robust Orthogonalization to Remove the Artefact Stimulus in Evoked Potential - 5Hz Current Sinusoidal Stimulus

The psychophysical evaluation of the sensibility of the thin and thick fibers with sinusoidal current stimulation was proposed in the 80s. After that, researches observed that 5 Hz stimulus would be related to the thin unmyelinated fiber. This work aims a quantitative analysis of the cerebral cortex response to 5 Hz stimulus, through the identification of the latency components of the evoked potential (EP) that were estimated by the coherent mean after remove the stimulus artefact by using the Independent Component Analysis. Electroencephalography (EEG) signals were collected at Cz electrode (10-20 International Standard System) of 5 volunteers. The EP estimated with 5 Hz stimulus using the Second Order Blind Identification associated with Robust Orthogonalization (SOBI-RO) associated with the coherent mean presented the following components: N1 = 104 ms (one volunteer), P1 = 179 ms (four volunteers) and N2 = 234 ms (three volunteers), P2 = 280 ms (three volunteers) and N3 = 493 ms (all volunteers). The SOBIRO techniques can be a very useful tool in artefacts and noise reduction on the EP estimation.