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Abstract

Continuous change of illuminance over retinal area in accordance with the sinusoidal function was studied as a stimulus for the human visual system. Its efficiency in controlling pursuit eye movements was compared with that of a stepwise luminance function (square wave). Such distributions of luminance were generated on a cathode ray screen (wavelength at the eye 9° and 3°) and were given a small translatory motion (2° – 12′). Ss were instructed to follow the moving pattern with pursuit eye movements. There is no difference in performance between the two types of brightness distributions. A stimulus motion of 24′ was sufficient to produce full evidence of eye tracking in all Ss also from the contour-free sinusoidal pattern. This means that the brightness change in every point of the CRT screen was far below the retinal sensitivity threshold at the illuminance level used. Thus a summation effect occurs. This was taken as a support for an hypothesis about “ordinal” stimulation. Arguments from modern neurophysiology are introduced and yield further support for the conclusion.

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References

Barlow

H. B.

Summation and inhibition in the frog's retina. J. Physiol., 1953, 119, 69–88.

Barlow

H. B.

Hill

R. M.

Selective sensitivity to direction of movement in ganglion cells of the rabbit retina. Science, 1963, 139, 412–414.

Baumgartner

Brown

J. L.

Schulz

Responses of single units of the cat visual system to rectangular stimulus patterns. J. Neurophysiol., 1964, 27, 2–17.

Burns

B. D.

Heron

Pritchard

Physiological excitation of visual cortex in cat's unanaesthetized isolated forebrain. J. Neurophysiol., 1962, 25, 165–181.

Ekman

Dahlbaeck

A subjective scale of velocity. In Spiegel

(Ed.), Readings in the study of visually perceived movement. New York: Harper & Row, 1965. Pp. 108–119.

Finkelstein

Gruesser

O.-J.

Frog retina: Detection of movement. Science, 1965, 150, 1050–1051.

Gibson

J. J.

The perception of the visual world. New York: Houghton Mifflin, 1950.

Gruesser-Cornehls

Gruesser

O.-J.

Bullock

T. H.

Unit responses in the frog's tectum to moving and nonmoving visual stimuli. Science, 1963, 141, 820–822.

Hubel

D. H.

Wiesel

T. N.

Receptive fields, binocular interaction, and functional architecture in the cat's visual cortex. J. Physiol., 1962, 160, 106–123.

10.

Hubel

D. H.

Wiesel

T. N.

Receptive fields and functional architecture in two nonstriate areas (18 and 19) of the cat. J. Neurophysiol., 1965, 28, 229–289.

11.

Johansson

Geschehenswahrnehmung. In Handbuch der Psychologie. Bd 1/1. Goettigen. Verlag für Psychologie, 1966. Pp. 745–775.

12.

Johansson

Backlund

A versatile eye movement recorder. Scand. J. Psychol., 1960, 1, 181–186.

13.

Jung

Neural integration in the visual cortex and its significance for visual information. In Rosenblith

A. J.

(Ed.), Sensory communication. New York: Wiley, 1961. Pp. 627–674.

14.

Lettvin

J. Y.

Maturana

H. R.

McCulloch

W. S.

Pitts

W. H.

What the frog's eye tells the frog's brain. Proc. IRE, 1959, 17, 1940–1951.

15.

Maturana

H. R.

Frenck

Directional movement and horizontal edge detectors in the pigeon retina. Science, 1963, 142, 977–979.

16.

Michael

C. R.

Receptive fields of directionally selective units in the optic nerve of the ground squirrel. Science, 1966, 152, 1092–1097.

17.

Ogle

K. N.

Blurring of the retinal image and contrast threshold in the fovea. J. Opt. Soc. Amer., 1960, 50, 307–315.

18.

Ogle

K. N.

Foveal contrast thresholds with blurring of the retinal image and increasing size of test stimulus. J. Opt. Soc. Amer., 1961, 51, 862–869. (a).

19.

Ogle

K. N.

Peripheral contrast thresholds and blurring of the retinal image for a point light source. J. Opt. Soc. Amer., 1961, 51, 1265–1268. (b).

20.

Ratliff

Mach bands. London: Holden-Day, 1965.

21.

Reeves

The response of the average pupil to various intensities of light. J. Opt. Soc. Amer., 1920, 4, 35–43.

22.

Steinhardt

Intensity discrimination in the human eye. J. gen. Physiol., 1936, 20, 185–209.

23.

Store

Fabian

Specialized receptive fields of the cat's retina. Science, 1966, 152, 1277–1279.

Vision without Contours: Study of Visual Information from Ordinal Stimulation

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