Evoked potential contrast sensitivity in the parafovea: Spatial organization

Visual evoked potential contrast sensitivity functions (VEP/CSFs) were determined for counterphase flickered sine-wave gratings in circular fields up to 8 degrees in diameter centered on the fovea. VEP sources responding to 16 c/deg gratings appeared to be concentrated in the central 2 degrees of the visual field while sources responding to lower spatial frequencies appeared to be distributed over progressively wider areas of the visual field as spatial frequency decreased. It was also found that independently determined VEP/CSFs for non-overlapping annular regions of the visual field centered on the fovea summed to equal the VEP/CSF obtained when both regions were stimulated simultaneously.

[1]  J. Movshon,et al.  Spatial summation in the receptive fields of simple cells in the cat's striate cortex. , 1978, The Journal of physiology.

[2]  J. Movshon,et al.  Receptive field organization of complex cells in the cat's striate cortex. , 1978, The Journal of physiology.

[3]  J. Movshon,et al.  Spatial and temporal contrast sensitivity of neurones in areas 17 and 18 of the cat's visual cortex. , 1978, The Journal of physiology.

[4]  J C Armington,et al.  The electroretinogram, the visual evoked potential, and the area-luminance relation. , 1968, Vision research.

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

[6]  K Nakayama,et al.  Rapid assessment of visual function: an electronic sweep technique for the pattern visual evoked potential. , 1979, Investigative ophthalmology & visual science.

[7]  J. McCann,et al.  Visibility of low-frequency sine-wave targets: Dependence on number of cycles and surround parameters , 1978, Vision Research.

[8]  J. McCann,et al.  Visibility of low-spatial-frequency sine-wave targets: Dependence on number of cycles. , 1975, Journal of the Optical Society of America.

[9]  M. A. Bouman,et al.  Perimetry of contrast detection thresholds of moving spatial sine wave patterns. I. The near peripheral visual field (eccentricity 0 degrees-8 degrees). , 1978, Journal of the Optical Society of America.

[10]  D. G. Albrecht,et al.  Spatial frequency selectivity of cells in macaque visual cortex , 1982, Vision Research.

[11]  G. J. van der Wildt,et al.  Contrast sensitivity as a function of position on the retina , 1980, Vision Research.

[12]  H G Vaughan,et al.  Cortical responses to stimulation of the human fovea. , 1968, Vision research.

[13]  Mark W. Cannon,et al.  Contrast sensitivity: Psychophysical and evoked potential methods compared , 1983, Vision Research.

[14]  D M Parker,et al.  The Spatial Selectivity of Early and Late Waves within the Human Visual Evoked Response , 1977, Perception.

[15]  C. R. Cavonius,et al.  Low-frequency attenuation in the detection of gratings: Sorting out the artefacts , 1976, Vision Research.

[16]  R. Hess,et al.  The functional area for summation to threshold for sinusoidal gratings , 1978, Vision Research.

[17]  M. R. Harter,et al.  Evoked cortical responses to checkerboard patterns: effect of check-size as a function of retinal eccentricity. , 1970, Vision research.

[18]  F A Bilsen,et al.  The influence of the number of cycles upon the visual contrast threshold for spatial sine wave patterns. , 1974, Vision research.

[19]  C T White,et al.  Evoked cortical responses to checkerboard patterns: effect of check-size as a function of visual acuity. , 1970, Electroencephalography and clinical neurophysiology.