THE EFFECT OF INDUCING LUMINANCE ON A BRIGHTNESS PARADOX I AND II by Sten Sture Bergström, Berit Ru

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THE EFFECT OF INDUCING LUMINANCE ON A BRIGHTNESS PARADOX I AND II

Author : Sten Sture Bergström, Berit Rubenson

Publisher : Department of Psychology, University of Uppsala

Published : 1969

ISBN-10 :

ISBN-13 :

Number of Pages : 24 Pages

Language : en

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Results THE EFFECT OF INDUCING LUMINANCE ON A BRIGHTNESS PARADOX I AND II

Photosensitivity and Seizures | Epilepsy Foundation - Watch television in a well-lit room to reduce the contrast between light from the set and light in the room. Reduce the brightness of the screen. Sit as far back from the screen as possible. Use the remote control to change channels on the TV so you won't have to get too close to the set. Avoid watching for long periods of time

Effects of luminance, contrast, and blur on visual acuity - At all blur and luminance levels, visual acuity decreases gradually for contrast levels down to 20%, and decreases sharply for lower contrast levels. Over the range of background luminances we tested (75.0 to 0.075 cd/m2), visual acuity decreases linearly with reductions in luminance. The additive effects of dioptric blur, contrast, and

(PDF) The effects of color on brightness - ResearchGate - We investigated gender differences in the H-K effect by measuring brightness (via direct brightness matching [DBM]) and luminance (via heterochromatic flicker photometry [HFP]) at five wavelengths

Luminescence - Luminescence physics | Britannica - Luminescence physics Mechanism of luminescence. The emission of visible light (that is, light of wavelengths between about 690 nanometres and 400 nanometres, corresponding to the region between deep red and deep violet) requires excitation energies the minimum of which is given by Einstein's law stating that the energy (E) is equal to Planck's constant (h) times the frequency of light (ν

PDF Chromatic Assimilation: Evidence Fora Neural Mechanism - of the test region judged in color. This implies that scaling the luminance of inducing light has a lawful effect on light in the test region, so if this light mediates chromatic assimilation then matches set by the observer will lawfully follow the inducing-light luminance. Measurements for two observers, however, show that the inducing luminance

What is Luminance? - Meaning, Definition, Formula, Uses - BYJU'S - The intensity or the photoelectric effect that is measured on a surface at a specific position is known as illuminance. In simple words, luminance is the intensity of the emitted light from a surface per unit area in a particular direction that can be considered for its definition. It provides the amount of light that passes through, is

Simultaneous Brightness Contrast and the Pulfrich Phenomenon - This was the Pulfrich effect. When an inducing field was presented slightly peripherally to the observer's left eye, this produced a displacement of the moving object toward the observer, or in the opposite direction of the Pulfrich phenomenon. Displacement was directly proportional to inducing luminance

Bright illusions reduce the eye's pupil | PNAS - For the two Kanisza figures, given that the addition of extra lines and forms increases the number of black pixels and therefore decreases luminance, brightness was controlled by changing the size of the inducing shapes so that the mean luminance of each picture also remained constant. Each target image was presented for 4 s

homework and exercises - Brightness of lamp - Physics Stack Exchange - 0. Brightness of lamp (power) depends on two factors: 1)Current which flows through the lamp. 2) voltage (p.d) across the lamp. First of all, obviously this is not true for all types of lamps because it says the brightness (lumens) of a lamp depends only on wattage. We know than an LED light of equal brightness to a tungsten filament light is

Understand Illuminance, Luminance & Brightness | X-Rite - The best way to understand the difference between luminance and illuminance is to picture a lamp shining on a desk. Luminance describes the amount of light passing through the lightbulb, while illuminance describes the light hitting the desk. Because luminance and illuminance are quantifiable, they are not interchangeable with brightness

Perception Lecture Notes: Brightness and Contrast - Center for Neural - Brightness judgements can be influenced by high-level perceptual factors (, 3D interpretation). Top: The two labeled squares are the same physical shade of gray and they appear the The same two squares now look very different. This pattern is made of patches with the same gray shades , but has a different geometry (contours) leading to a different 3D interpretation and a

Luminance - Wikipedia - Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle.. Brightness is the term for the subjective impression of the objective luminance measurement standard (see Objectivity (science

The influence of light on mood and emotion - ResearchGate - On the feedback side, we explore the use of ambient light as an emotional feedback modality. Light was shown to have an effect on moods and emotions, , by influencing the circadian system [10

Luminescence - an overview | ScienceDirect Topics - Luminescence is a very promising method for aging investigations of the embedding polymer in PV modules. A correlation to the exposure duration and the parameters of accelerated aging is found. It is a sensitive method; changes of the luminescence due to accelerated aging can be detected in less than 500 h of testing

The effect of luminance differences on color assimilation - The effects of achromatic contrast (either luminance or brightness contrast) on color induction have received relatively less attention from the scientific community. Luminance is the photometric measure of luminous intensity per unit area of light travelling in a given direction and is usually measured by photometric devices

Effect of illumination on perceived temperature | PLOS ONE - The widely known hue-heat effect, a multisensory phenomenon between vision and thermal sensing, is a hypothesis based on the idea that light and colors affect perceived temperature. However, the application of this effect has not been prevalent in our daily lives. To work towards developing more practical use of the hue-heat effect, we conducted a series of psychophysical experiments to

What affects the brightness of a bulb? - Bluetree Education Group - The bulb lights up when the electric current flows through the wire and the bulb and back to the power source. Without a power source, there would not be (electrical) energy for the system to do work ( to light up the bulb in the above electrical circuit). On the other hand, the greater the number of power source, the greater the amount of

Lightness, brightness, and brightness contrast: 1. Illuminance - Simultaneous brightness induction as a function of inducing- and test-field luminances. ... Whittle, P., & Challands, P. D. C. (1969). The effect of background luminance on the brightness of Research,9, 1095-1110

Luminescence | Definition, Examples, Types, & Facts | Britannica - luminescence, emission of light by certain materials when they are relatively cool. It is in contrast to light emitted from incandescent bodies, such as burning wood or coal, molten iron, and wire heated by an electric current. Luminescence may be seen in neon and fluorescent lamps; television, radar, and X-ray fluoroscope screens; organic substances such as luminol or the luciferins in

Light & Sleep: Effects on Sleep Quality | Sleep Foundation - The way light alters circadian rhythm depends on the timing of light exposure. When light is perceived early in the morning, it pushes the sleep schedule earlier. Light exposure in the evening pushes the sleep cycle backward toward a later bedtime. Circadian effects vary based on the type of light and the duration of exposure

Photoelectric effect (article) | Photons | Khan Academy - When light shines on a metal, electrons can be ejected from the surface of the metal in a phenomenon known as the photoelectric effect. This process is also often referred to as photoemission, and the electrons that are ejected from the metal are called photoelectrons. In terms of their behavior and their properties, photoelectrons are no

Luminescence - Wikipedia - UV-photoluminescence in microbiological diagnostics. Luminescence is the " spontaneous emission of radiation from an electronically excited species (or from a vibrationally excited species) not in thermal equilibrium with its environment", according to IUPAC definition. A luminescent object is emitting "cold light", in contrast to

How Lighting Choices Can Affect Your Mood | Psychology Today - Natural light has the potential to enhance people's mood, creativity, and cognitive performance. Warm lighting can help create a cozy, social atmosphere, while cool lighting can help create an

Isolation of brightness induction effects on target patches from - The brightness (perceived intensity) of a region of visual space depends on its luminance and on the luminance of nearby regions. This phenomenon is called brightness induction and includes both brightness contrast and assimilation. Historically, and on a purely descriptive level, brightness contrast refers to a directional shift in target brightness away from the brightness of an adjacent

Illuminating the Effects of Dynamic Lighting on Student Learning - The Effects of Lighting on Humans in General The human evolution is shaped by light. In the course of evolution, human beings have adapted and developed an internal clock that under natural light conditions is synchro-nized to the earth's 24-hr light-dark rotational cycle (Czeisler et al., 1999). Research reveals the mechanism for how light

Anchoring of lightness values by relative luminance and relative area - The region of highest luminance was always seen as white. The lightness of the darker sector depended on relative area, appearing lighter as the darker sector became larger, but this effect was stronger when the darker sector was larger than the lighter, a pattern of results shown to be consistent with over a dozen prior studies of relative

The influence of depicted illumination on brightness | PNAS - Measurements of the effects of the altered depictions of illumination shown in Fig. 3. The upper bar in the graph shows the average brightness adjustments made by eight subjects to equate the brightness of the diamond on the dark surround with that of the diamond on the light surround in the depiction of added shadow (indicated on the left)

Illuminating Luminescence - Science Friday - Activity Type: Luminescence is the emission of light produced by means other than heat. Bioluminescence is just one of the many forms of luminescence. Often, these types of luminescence are mistakenly grouped together but each one differs in their method of emitting light. In this activity, students will compare and contrast different forms of

What is Faraday's law? (article) | Khan Academy - Lenz's law is a consequence of conservation of energy applied to electromagnetic induction. It was formulated by Heinrich Lenz in 1833. While Faraday's law tells us the magnitude of the EMF produced, Lenz's law tells us the direction that current will flow. It states that the direction is always such that it will oppose the change in flux which

Relations between brightness and luminance under induction - The translated results of brightness matching turned out to be completely analogous to results of subjective estimations. By means of plotting the results in terms of subjective estimations relations between brightness and luminance under induction could be easier described

20.3 Electromagnetic Induction - Physics | OpenStax - Define the direction of the magnetic field to be the positive direction. This means the change in the magnetic field is negative, as we found above. The minus sign in Faraday’s law of induction negates the negative change in the magnetic field, leaving us with a positive current

Simultaneous brightness induction as a function of inducing - It was found that inducing fields of luminance much lower than the test-field luminance slightly enhance the visual effect of the test field. Inducing fields of luminance almost as great or greater than the test-field luminance depress the visual effect of the test field. Possible theoretical interpretations of the results and the application

(PDF) The effects of color on brightness - ResearchGate - The influence of color on brightness provides further evidence that perceptions of luminance are generated according to the empirical frequency of the possible sources of visual stimuli,

Perception Lecture Notes: Brightness and Contrast - Center for Neural - What processes affect perceived brightness?

Photoelectric effect (article) | Photons | Khan Academy - Because the light amplitude was kept constant as the light frequency increased, the number of photons being absorbed by the metal remained constant. Thus, the rate at which electrons were ejected from the metal (or the electric current) remained constant as well

Perception Lecture Notes: Brightness and Contrast - See full list on