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Pattern rotation system for a visual stimulator

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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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References

  • Atkinson, J., Braddick, O. andBraddick, F. (1974) Acuity and contrast sensitivity of infant vision.Nature (Lond.),247, 403–404.

    Article  Google Scholar 

  • Blakemore, C., Fiorentini, A. andMaffei, L. (1972) A second neuroal mechanism of bioncular depth discrimation.J. Physiol.,226, 725–749.

    Google Scholar 

  • 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.

    Google Scholar 

  • Fiorentini, A., Ghez, C. andMaffei, L. (1972) Physiological correlates of adaptation to a rotated visual field.J. Physiol. (Lond.),227, 313–322.

    Google Scholar 

  • Fiorentini, A. andMaffei, L. (1973) Evoked potentials in astigmatic subjects.Vision Res.,13, 1781–1783.

    Article  Google Scholar 

  • 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.

    Article  Google Scholar 

  • 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.

    Article  Google Scholar 

  • Hughes, A. andSnow, G. R. (1973) A visual stimulator employing a T. V. raster display.Vision res.,13, 1187–1193.

    Article  Google Scholar 

  • Maffei, L. andCampbell, F. W. (1970) Neurophysiological coordinates in man.Science, N.Y.,167, 386–387.

    Google Scholar 

  • Pirchio, M., Spinelli, D., Fiorentini, A. andMaffei, L. (1978) Infant contrast sensitivity evaluated by evoked potentials.Brain Research,141, 179–184.

    Article  Google Scholar 

  • Sokol, S. andDobson, V. (1976) Pattern reversal visually evoked potentials in infants.Investig. Opthalm.,15, 58–62.

    Google Scholar 

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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

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