Abstract
A fully electronic system providing the rotation of the pattern in a visual stimulator is described. The electronic method of achieving rotation offers substantial advantages compared with the previous mechanical ones, owing mainly to its faster speed. Positive and negative rotations ranging from 0° to+90° can be selected. The system acts exclusively on the deflection of an electrostatic deflection cathode-ray tube display.
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Atkinson, J., Braddick, O. andBraddick, F. (1974) Acuity and contrast sensitivity of infant vision.Nature (Lond.),247, 403–404.
Blakemore, C., Fiorentini, A. andMaffei, L. (1972) A second neuroal mechanism of bioncular depth discrimation.J. Physiol.,226, 725–749.
Campbell, F. W. andMaffei, L. (1970) Electrophysiological evidence for the existence of orientation and size detectors in the human visual system.J. Physio. (Lond.),207, 635–652.
Fiorentini, A., Ghez, C. andMaffei, L. (1972) Physiological correlates of adaptation to a rotated visual field.J. Physiol. (Lond.),227, 313–322.
Fiorentini, A. andMaffei, L. (1973) Evoked potentials in astigmatic subjects.Vision Res.,13, 1781–1783.
Harris, L., Atkinson, J. andBraddick, O. (1976) Visual contrast sensivity of a 6-month-old infant measured by the evoked potential.Nature (Lond.),264, 570–571.
Harter, M. R. andWhite, C. T. (1970) Evoked cortical responses to checkerboard patterns: effects of check-size as a function of visual acuity.Electroenceph. Clin. Neurophysiol.,28, 48–54.
Hughes, A. andSnow, G. R. (1973) A visual stimulator employing a T. V. raster display.Vision res.,13, 1187–1193.
Maffei, L. andCampbell, F. W. (1970) Neurophysiological coordinates in man.Science, N.Y.,167, 386–387.
Pirchio, M., Spinelli, D., Fiorentini, A. andMaffei, L. (1978) Infant contrast sensitivity evaluated by evoked potentials.Brain Research,141, 179–184.
Sokol, S. andDobson, V. (1976) Pattern reversal visually evoked potentials in infants.Investig. Opthalm.,15, 58–62.
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Macellari, V. Pattern rotation system for a visual stimulator. Med. Biol. Eng. Comput. 18, 601–606 (1980). https://doi.org/10.1007/BF02443132
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DOI: https://doi.org/10.1007/BF02443132