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A text-book of experimental psychology.On visual sensations.

A text-book of experimental psychology.: On visual sensations. The Characters of Visual Sensations.—Our visual sensations comprise colourless and colour sensations. The series of colourless sensations include every shade of grey between the most blinding white and the deepest black (experiment 45). Colour sensations include not only the various "spectral" hues which are afforded by the analysis of daylight, but also others which are not to be thus obtained, e.g., purple and carmine. They differ in hue (or colour), intensity, saturation, and brightness. The normal (or "adequate") stimulus to the retina is a series of wave movements in the surrounding ether. The various hues, seen in the spectrum, are dependent on the different lengths of these waves, sensations of red being excited by the longest, those of the violet by the shortest ethereal waves. But, as we shall see presently, these (and other) hues are also obtainable by appropriate mixtures of ethereal waves. The intensity of a colour (or colourless) sensation is dependent on the intensity of the stimulus, i.e. on the amplitude of the light waves which fall upon the retina. The saturation of a colour sensation is dependent on the amount of white light that simultaneously excites the same retinal area (experiment 46). The spectrum affords, with less difficulty, more highly saturated sensations than any other external source of stimuli. Simultaneous Contrast.—Phenomena, analogous to those of successive contrast, also occur owing to the influence which neighbouring areas of the retina exert upon one another; they are effects of "simultaneous contrast." For example, a given patch of grey or of colour tends to be tinged in the colour complementary to that stimulating the rest of the retina; this is known as "colour contrast" (experiments 57-60). (PsycInfo Database Record (c) 2023 APA, all rights reserved) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

A text-book of experimental psychology.On visual sensations.

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Publisher
Longmans, Green and Co
Copyright
Copyright © 1909 American Psychological Association
Pages
76 –91
DOI
10.1037/13628-006
Publisher site
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Abstract

The Characters of Visual Sensations.—Our visual sensations comprise colourless and colour sensations. The series of colourless sensations include every shade of grey between the most blinding white and the deepest black (experiment 45). Colour sensations include not only the various "spectral" hues which are afforded by the analysis of daylight, but also others which are not to be thus obtained, e.g., purple and carmine. They differ in hue (or colour), intensity, saturation, and brightness. The normal (or "adequate") stimulus to the retina is a series of wave movements in the surrounding ether. The various hues, seen in the spectrum, are dependent on the different lengths of these waves, sensations of red being excited by the longest, those of the violet by the shortest ethereal waves. But, as we shall see presently, these (and other) hues are also obtainable by appropriate mixtures of ethereal waves. The intensity of a colour (or colourless) sensation is dependent on the intensity of the stimulus, i.e. on the amplitude of the light waves which fall upon the retina. The saturation of a colour sensation is dependent on the amount of white light that simultaneously excites the same retinal area (experiment 46). The spectrum affords, with less difficulty, more highly saturated sensations than any other external source of stimuli. Simultaneous Contrast.—Phenomena, analogous to those of successive contrast, also occur owing to the influence which neighbouring areas of the retina exert upon one another; they are effects of "simultaneous contrast." For example, a given patch of grey or of colour tends to be tinged in the colour complementary to that stimulating the rest of the retina; this is known as "colour contrast" (experiments 57-60). (PsycInfo Database Record (c) 2023 APA, all rights reserved)

Published: Feb 13, 2012

Keywords: visual sensations; color spectrum; retinal area; colorless sensations; wave movements; ether; spectral hues; white light; visual contrast; color contrast; color intensity

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