Normal variability of the amplitude and phase of steady-state VEPs

Shozo Tobimatsu, Hiroyuki Tomoda, Motohiro Kato

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The present study quantifies the amplitude and phase variability of steady-state VEPs (S-VEPs) and compares this variability between subjects and between individual runs. The S-VEPs were recorded repeatedly in 14 normal subjects with varying spatial and temporal frequencies of sinusoidal gratings; 6 spatial frequencies (range 0.5-8.0 c/deg) with 3 temporal frequencies (4, 6 and 8 Hz) were used. A total of 75 responses were averaged and analyzed by the Fourier method. Four recordings were obtained in each spatio-temporal combination. In general, the phase data showed small inter- and intrasubject variability. As anticipated, the amplitude data showed a large degree of intersubject variability, although the intrasubject variability was very small. In addition, in some stimulus conditions the inter- and intrasubject variability increased, which thus suggested the existence of an optimal spatio-temporal combination. Therefore, these stimulus parameters should be taken into consideration when S-VEPs are applied in clinical practice.

Original languageEnglish
Pages (from-to)171-176
Number of pages6
JournalElectroencephalography and Clinical Neurophysiology - Evoked Potentials
Issue number3
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Clinical Neurology

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