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Changes of middle latency somatosensory evoked potentials (SEPs) and alpha rythmicity associated with oculomotor
M Kamoda1, T Touge, M Ikeguchia
1Third Department of Internal Medicine, Kagawa Medical University, 1750-1, Miki, Kita-gun, 761-0793, Kagawa, Japan.
Objectives:
To evaluate median nerve somatosensory evoked potentials (SEPs) and alpha waves during different eye conditions.
Methods:
Median SEPs and occipital electroencephalographs (EEG) were recorded in 6 eye conditions: eye-closed (EC), goggle (G), goggle+saccade (GS), saccade (S), eye-opened (EO) and pursuit (P), in 8 normal adults. Subjects saccaded their eyes reacting to auditory cues to watch a diode on the right or left side alternatively during the S condition, or imitated the same saccadic eye-movement as that in the S condition during the GS condition. In the P condition, subjects traced a small circle moving on a computer screen.
Results:
Compared with the EC and G conditions, N30 (P25-N30 or P14-N30) amplitudes in C4' were significantly larger and the mean amplitude and power of the alpha band was significantly attenuated in the other 4 conditions. The amplitude and power of the alpha band differed significantly between the GS and S conditions, whereas N30 amplitudes were similar between the two conditions. N30-P45 or P45-N60 amplitudes in C4' were significantly larger in the P condition than in other conditions.
Conclusions:
Present findings suggest that different neural mechanisms cause alpha blocking and the modification of middle latency SEPs associated with oculomotor control.