Search Results - "Hecht, Selig"

THE VISUAL DISCRIMINATION OF INTENSITY AND THE WEBER-FECHNER LAW by Hecht, S

“…1. A study of the historical development of the Weber-Fechner law shows that it fails to describe intensity perception; first, because it is based on…”
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INTERMITTENT STIMULATION BY LIGHT by Hecht, Selig, Smith, Emil L.

“…1. In the retina, central areas whose diameter is less than 2° possess only cones, while larger areas have rods and cones. In conformity with this, the…”
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INTERMITTENT STIMULATION BY LIGHT by Hecht, Selig, Shlaer, Simon

“…1. An optical system is described which furnishes large flickering fields whose brightness, even when reduced with monochromatic filters, is capable of…”
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INTERMITTENT STIMULATION BY LIGHT by Hecht, Selig, Verrijp, Cornelis D.

“…A theoretical treatment of the data of intermittent stimulation by light is presented in terms of the familiar reversible photochemical system previously used…”
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ENERGY, QUANTA, AND VISION by Hecht, S, Shlaer, S, Pirenne, M H

“…1. Direct measurements of the minimum energy required for threshold vision under optimal physiological conditions yield values between 2.1 and 5.7 x 10(-10)…”
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INTENSITY DISCRIMINATION IN THE HUMAN EYE by Hecht, Selig, Peskin, James C., Patt, Marjorie

“…1. A new apparatus is described for measuring visual intensity discrimination over a large range of intensities, with white light and with selected portions of…”
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INTERMITTENT STIMULATION BY LIGHT by Hecht, Selig, Shlaer, Simon, Verrijp, Cornelis D.

“…An apparatus and a procedure are described to measure the critical frequency of flicker using different portions of the eye. The observer, looking through a…”
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THE VISIBILITY OF SINGLE LINES AT VARIOUS ILLUMINATIONS AND THE RETINAL BASIS OF VISUAL RESOLUTION by Hecht, S, Mintz, E U

“…The visual resolution of a single opaque line against an evenly illuminated background has been studied over a large range of background brightness. It was…”
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THE DARK ADAPTATION OF RETINAL FIELDS OF DIFFERENT SIZE AND LOCATION by Hecht, S, Haig, C, Wald, G

“…The decrease in threshold shown by the eye during dark adaptation proceeds in two steps. The first is rapid, short in duration, and small in extent. The second…”
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The Influence of Intensity, Color and Retinal Location on the Fusion Frequency of Intermittent Illumination by Hecht, Selig, Verrijp, Cornelis D.

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THE INFLUENCE OF LIGHT ADAPTATION ON SUBSEQUENT DARK ADAPTATION OF THE EYE by Hecht, S, Haig, C, Chase, A M

“…The course of dark adaptation of the human eye varies with the intensity used for the light adaptation which precedes it. Preadaptation to intensities below…”
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Retinal Structure and Colour Vision: A Restatement and an Hypothesis . E. N. Willmer. Cambridge, Engl.: at the Univ. Press, 1946. Pp. xii + 231. (Illustrated.) $4.50 by Hecht, Selig

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Photosynthesis and Related Processes . Vol. I: Chemistry of Photosynthesis, Chemosynthesis and Related Processes in Vitro and in Vivo . Eugene I. Rabinowitch. New York: Interscience Publishers, 1945. Pp. xiv + 599. (illustrated.) $8.50 by Hecht, Selig

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ENERGY AND VISION by HECHT, SELIG

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PHOTOCHEMISTRY OF VISUAL PURPLE by Hecht, Selig

“…It is shown that the velocity of bleaching of visual purple by light, under comparable conditions of concentration, volume, and surface exposed, is directly…”
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PHOTOCHEMISTRY OF VISUAL PURPLE by Hecht, Selig

“…The temperature coefficient of the bleaching of visual purple by light is 1.00 over a range of 30 degrees. This indicates that the monomolecular course of the…”
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PHOTOCHEMISTRY OF VISUAL PURPLE by Hecht, Selig

“…1. Visual purple solutions are prepared under such conditions that the bleaching reaction is irreversible. 2. A method is described for the colorimetric…”
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THE PHOTOCHEMICAL NATURE OF THE PHOTOSENSORY PROCESS by Hecht, Selig

“…On page 243, Vol. ii, No. 3, January 20, 1920, line 12 (counting each equation as a line) for a photochemical reaction read a reversible photochemical reaction…”
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Biological Symposia, Volume VII: Visual Mechanisms . Heinrich Klüver by Hecht, Selig

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THE PHYSIOLOGY OF ASCIDIA ATRA LEUSEUR: III. T he B lood S ystem by Hecht, Selig

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