title: Changes of middle latency somatosensory evoked potentials (SEPs) and alpha rythmicity associated with oculomotor processes.
abstract: OBJECTIVE
  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.
authors.affiliation: Third Department of Internal Medicine, Kagawa Medical University, 1750-1, Miki, Kita-gun, 761-0793, Kagawa, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kamoda
authors.forename: T
authors.initials: T
authors.lastname: Touge
authors.forename: M
authors.initials: M
authors.lastname: Ikeguchia
authors.forename: K
authors.initials: K
authors.lastname: Deguchi
authors.forename: S
authors.initials: S
authors.lastname: Watanabe
authors.forename: H
authors.initials: H
authors.lastname: Takeuchi
mesh_terms: D000328:Adult; D000513:Alpha Rhythm; D005073:Evoked Potentials, Somatosensory; D005143:Eyelids / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D009801:Oculomotor Muscles / Q000502:physiology*; D011698:Pursuit, Smooth / Q000502:physiology; D011930:Reaction Time; D012438:Saccades / Q000502:physiology