Visual temporal frequency characteristic determined by pseudorandom stimuli

Keiko Momose, Motohiro Kiyosawa, Nobuyuki Nemoto, Yuichi Kimura, Fumio Okuyama, Michio Senda

研究成果: Article

9 引用 (Scopus)

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Purpose. To investigate whether a rapid and practical determination of the temporal frequency characteristic (TFC) of the visual system can be obtained by using the visually evoked potentials (VEPs) elicited by pseudorandom binary sequence (PRBS) stimulation. Methods. VEPs were recorded from eight volunteers. For the conventional steady state VEPs (S-VEP), the eye was stimulated with five stimulus frequencies. To acquire the PRBS-VEPs, the eye was stimulated with a PRBS stimulus for 40 seconds. The TFC for the S-VEP was calculated from the root mean squared amplitude for each frequency using Fourier transform. For the PRBS stimulus, a cross-correlation function between PRBS (x[t]) and PRBS-VEP (y[t]) was calculated to obtain the TFC. Results. The TFCs obtained by the PRBS and S-VEP methods were highly correlated (P < 0.05), and the TFC curves resembled those in the literature. Most important, the data necessary to determine the TFCs using the PRBS stimulus could be obtained in 4 minutes, whereas that for the S-VEP required 60 minutes for the two eyes. Conclusions. The high correlation between the TFCs obtained by the two methods indicated that the PRBS technique gives a good measure of the TFC of the human visual system. The significantly shorter time required for this method demonstrated that it is a practical method for determining the linear (and nonlinear) property of the visual system and that it may be useful in clinical applications.

元の言語English
ページ(範囲)50-54
ページ数5
ジャーナルInvestigative Ophthalmology and Visual Science
40
発行部数1
出版物ステータスPublished - 1999 1 20
外部発表Yes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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  • これを引用

    Momose, K., Kiyosawa, M., Nemoto, N., Kimura, Y., Okuyama, F., & Senda, M. (1999). Visual temporal frequency characteristic determined by pseudorandom stimuli. Investigative Ophthalmology and Visual Science, 40(1), 50-54.