Effects of meridional variation on steady-state visual evoked potentials

Abstract Two experiments were carried out to assess the influence of meridional variations on the visually evoked potentials (VEPs) elicited by pattern alternation. The first experiment involved a comparison of the oblique effect obtained with grating and checkerboard stimuli. Greater amplitudes resulted using stimuli which contained vertically, as opposed to obliquely, oriented fundamental Fourier components. The second experiment revealed that the peak delay * of the VEP was markedly shorter when subjects wore cylindrical lenses oriented such that they emphasized a fundamental Fourier component of the checkerboard stimulus. These results underline the importance of describing complex patterned stimuli in terms of Fourier analysis when evaluating meridional aspects of visual function.

[1]  D. Regan.  Evoked Potentials in Psychology, Sensory Physiology and Clinical Medicine , 1972 .

[2]  J C Armington,et al.  Simultaneously recorded retinal and cortical responses to patterned stimuli. , 1971, Journal of the Optical Society of America.

[3]  D Regan,et al.  Independence of evoked potentials and apparent size. , 1971, Vision research.

[4]  F. Campbell,et al.  Electrophysiological evidence for the existence of orientation and size detectors in the human visual system , 1970, The Journal of physiology.

[5]  D. Levi,et al.  A sensory mechanism for amblyopia: electrophysiological studies. , 1978, American journal of optometry and physiological optics.

[6]  D Regan,et al.  Brightness contrast and evoked potentials. , 1973, Journal of the Optical Society of America.

[7]  J G May,et al.  Spatial frequency-contingent color aftereffects. , 1976, Science.

[8]  D. H. Kelly.  Pattern detection and the two-dimensional Fourier transform: Flickering checkerboards and chromatic mechanisms , 1976, Vision Research.

[9]  D. Regan.  Assessment of visual acuity by evoked potential recording: Ambiguity caused by temporal dependence of spatial frequency selectivity , 1978, Vision Research.

[10]  C Blakemore,et al.  On the existence of neurones in the human visual system selectively sensitive to the orientation and size of retinal images , 1969, The Journal of physiology.

[11]  F. Campbell,et al.  Neurophysiological Localization of the Vertical and Horizontal Visual Coordinates in Man , 1970, Science.

[12]  J G May,et al.  Letter: Evoked potential correlates of adaptation to wavelength and orientation. , 1974, Vision Research.

[13]  B. Frost,et al.  The Orientation Anisotropy and Orientation Constancy: A Visual Evoked Potential Study , 1975, Perception.

[14]  J. May,et al.  The visual evoked response obtained with an alternating barred pattern: rate, spatial frequency and wave length. , 1971, Electroencephalography and clinical neurophysiology.

[15]  A M Halliday,et al.  Changes in pattern‐evoked responses in man associated with the vertical and horizontal meridians of the visual field , 1970, The Journal of physiology.

[16]  M Millodot,et al.  Refraction determined electrophysiologically. Responses to alternation of visual contours. , 1970, Archives of ophthalmology.

[17]  D. Regan.  Some characteristics of average steady-state and transient responses evoked by modulated light. , 1966, Electroencephalography and clinical neurophysiology.

[18]  S. Appelle.  Perception and discrimination as a function of stimulus orientation: the "oblique effect" in man and animals. , 1972, Psychological bulletin.

[19]  V Zemon,et al.  A comparison of Fourier analysis and feature analysis in pattern-specific color aftereffects. , 1976, Science.

[20]  W. Rietveld,et al.  Visual evoked responses to blank and to checkerboard patterned flashes. , 1967, Acta physiologica et pharmacologica Neerlandica.