Using Component Synchrony Measure for somatosensory evoked potential detection.
The multiple component synchrony measure (MCSM), a multivariate objective response detection (MORD) technique in the frequency domain, was applied to EEG signals during somatosensory stimulation of the right posterior tibial nerve collected from derivations [Fpz'-Cz'] and [C3'-C4'] of 10 adult volunteers. Stimuli were applied at the rate of 4.91 Hz and at the motor threshold intensity level. Detection was identified based on the null hypothesis of response absence rejection - when the estimates exceed the critical values (significance level alpha=0.05 and M=100, 400 and 800 epochs). For these three M values, detection was obtained in at least 80 % of the volunteers for the frequency range from 34.3 to 54.0 Hz, within the gamma band. With M=400, however, response could be detected in all subjects for this frequency range. Similar performance was observed for M=800. These findings indicate that MCSM is capable of objectively identifying stimuli response.
Melges
Danilo Barbosa
DB
Biomed. Eng. Program, Fed. Univ. of Rio de Janeiro, Brazil. dmelges@peb.ufrj.br
de Sà
Antonio Mauricio Ferreira Leite Miranda
AM
Catelli
Antonio Fernando
AF
D003198:Computer Simulation; D004558:Electric Stimulation; D004566:Electrodes; D004569:Electroencephalography / Q000295:instrumentation*; D004867:Equipment Design; D019054:Evoked Potentials, Motor; D005073:Evoked Potentials, Somatosensory; D006801:Humans; D015233:Models, Statistical; D015999:Multivariate Analysis; D009991:Oscillometry; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D013003:Somatosensory Cortex