Skip to main content Accessibility help
×
Home

Spatial summation in blindsight

  • Petra Stoerig (a1)

Abstract

Spatial summation curves were determined in the circumscribed visual-field defects of five patients with blindsight. Under light-adapted conditions that favor the color-opponent system, increment thresholds for white and red targets presented on a white background were measured as a function of stimulus size which ranged from 9–110 min arc. In both normal and defective hemifields, summation was linear for the red stimuli. In contrast, the curves measured with the white stimuli showed some nonlinearity in the normal hemifield, and a pronounced eccentricity-dependent notch in the field defect. The results indicate that the neurons mediating sensitivity differ in their summation properties for wavelength and intensity information.

Copyright

References

Hide All
Bender, M.B. & Krieger, H.P. (1951). Visual function in perimetrically blind fields. Archives of Neurology and Psychiatry (Chicago) 65, 7279.
Blythe, I.M., Kennard, C. & Ruddock, K.H. (1987). Residual vision in patients with retrogeniculate lesions of the visual pathways. Brain 110, 887905.
Cowey, A., Stoerig, P. & Perry, V.H. (1989). Transneuronal retrograde degeneration in the retina of macaque monkeys: Selective loss of Pβ cells. Neuroscience 29, 6580.
Cowey, A. & Stoerig, P. (1991). The neurobiology of blindsight. Trends in Neuroscience 14, 140145.
Crook, J.M., Lange-Malecki, B., Lee, B.B. & Valberg, A. (1988). Visual resolution of macaque retinal ganglion cells. Journal of Physiology 396, 205224.
De Monasterio, F.M. (1978). Center and surround mechanisms of opponent-color x and y ganglion cells of retina of macaques. Journal of Neurophysiology 41, 14181434.
De Monasterio, F.M. & Gouras, P. (1975). Functional properties of ganglion cells in the rhesus monkey retina. Journal of Neurophysiology 41, 167195.
De Valois, R.L. (1972). Processing of intensity and wavelength information by the visual system. Investigative Ophthalmology 11, 417427.
De Valois, R.L., Snodderly, D.M., Yund, E.W. & Hepler, N.K. (1977). Responses of macaque lateral geniculate cells to luminance and color figures. Sensory Processes 1, 244259.
Fendrich, R., Wessinger, C.M. & Gazzaniga, M.S. (1992). Residual vision in a scotoma: Implications for blindsight. Science 258, 14891491.
King-Smith, P.E. & Garden, D. (1976). Luminance and colour-opponent contributions to visual detection and adaptation and to temporal and spatial integration. Journal of the Optical Society of America 66, 709717.
Kisvárday, Z.F., Cowey, A., Stoerig, P. & Somogyi, P. (1991). Direct and indirect retinal input into degenerated dorsal lateral geniculate nucleus after striate cortical removal in monkey: Implications for residual vision. Experimental Brain Research 86, 271292.
Mihailovic, L.T., Dragoslava, C. & Dekleva, N. (1971). Changes in the number of neurons and glial cells in the lateral geniculate nucleus of the monkey during retrograde cell degeneration. Journal of Comparative Neurology 142, 223230.
Ransom-Hogg, A. & Spillmann, L. (1980). Perceptive-field size in fovea and periphery of the light- and dark-adapted retina. Vision Research 20, 221228.
Robson, J.G. & Graham, N. (1981). Probability summation and regional variation in contrast sensitivity across the visual field. Vision Research 21, 409418.
Ronchi, L. & Fidanzati, G. (1972). Changes of psychophysical organization across the light-adapted retina. Journal of the Optical Society of America 62, 912915.
Sloan, L.L. (1971). The Tübinger perimeter of Harms and Aulhorn: Recommended procedures and supplementary equipment. Archives of Ophthalmology 86, 612622.
Snelgar, R.S., Foster, D.H. & Scase, M.O. (1987). Isolation of opponent-colour mechanisms at increment threshold. Vision Research 27, 10171027.
Sperling, H.G. & Harwerth, R.S. (1971). Red-green cone interactions in the increment-threshold spectral sensitivity of primates. Science 172, 180184.
Stoerig, P. (1987). Chromaticity and achromaticity. Evidence for a functional differentiation in visual field defects. Brain 110, 869886.
Stoerig, P. & Cowey, A. (1989 a). Spectral sensitivity in blindsight. Nature (London) 342, 916918.
Stoerig, P. & Cowey, A. (1989 b). Residual target detection as a function of stimulus size. Brain 112, 11231139.
Stoerig, P. & Cowey, A. (1991). Increment-threshold spectral sensitivity in blindsight. Evidence for colour opponency. Brain 114, 14871512.
Stoerig, P. & Cowey, A. (1992). Wavelength discrimination in blindsight. Brain 115, 425444.
Stoerig, P., Cowey, A. & Bannister, M. (1991). Retinal ganglion cells that project to the pulvinar nucleus in macaque monkeys. Society for Neuroscience Abstracts 17 / 1, 711.
Stoerig, P. & Zrenner, E. (1987). A pattern-ERG study of transneuronal retrograde degeneration in the human retina after a post-geniculate lesion. In Seeing Contour and Colour, ed. Kulikowski, J. J., Dickinson, C.M. & Murray, I.J., pp. 553556. Oxford, England: Pergamon Press.
Troscianko, T. (1982). A given visual-field location has a wide range of perceptive-field sizes. Vision Research 22, 13631369.
Van Buren, J.M. (1963). Trans-synaptic retrograde degeneration in the visual system of primates. Journal of Neurology, Neurosurgery, and Psychiatry 26, 402409.
Weiskrantz, L., Warrington, E.K., Sanders, M.D. & Marshall, J. (1974). Visual capacity in the hemianopic field following a restricted occipital ablation. Brain 97, 709728.
Weiskrantz, L. (1986). Blindsight: A Case Study and Implications. Oxford: Oxford University Press.
Weiskrantz, L., Harlow, A. & Barbur, J.L. (1991). Factors affecting visual sensitivity in a hemianopic subject. Brain 114, 22692282.
Weller, R.E. & Kaas, J.H. (1989). Parameters affecting the loss of ganglion cells of the retina following ablations of striate cortex in primates. Visual Neuroscience 3, 327342.
Wiesel, T.N. & Hubel, D.H. (1966). Spatial and chromatic interactions in the lateral geniculate body of the rhesus monkey. Journal of Neurophysiology 29, 11151156.
Wilson, M.E. (1967). Spatial and temporal summation in impaired regions of the visual field. Journal of Physiology (London) 189, 189208.

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed