Two separate neural mechanisms of brightness induction

Shevell, Steven K.; Holliday, Ian; Whittle, Paul

doi:10.1016/0042-6989(92)90096-2

Cited by 59 publications

(48 citation statements)

References 13 publications

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“…Attempts to provide a theoretical account for psychophysically observed brightness or darkness asymmetries generally suggest two-stage processing models, with a first stage that is sensitive to local contrast and its sign, and a second stage in which contrast intensity only, not its sign, is preserved (e.g., Hamada, 1991;Shapley & Reid, 1985;Shevell et al, 1992). The extent to which such models can make general predictions regarding the direction of a psychophysical brightness/darkness match is another question.…”

Section: Discussionmentioning

confidence: 99%

“…Hamada' s theory has been of relevance to Grossberg and Mingolla's (1985) macro-model approach to brightness-based form perception. Shevell, Holliday, and Whittle (1992) Although each of the theories briefly introduced here attempt to explain a limited set of psychophysical observations, they all converge toward the idea that, at some stage in the processing of brightness-based f igureground percepts, the direction, or sign, of local contrast has to be discarded. The present study, in which brightness/darkness cancellation procedures equivalent to the one described earlier by Dresp (1992) were used, was designed to shed more light on the possible functional significance of interactions between figure-ground organization (spatial factor) and figure-ground contrast (luminance factor) in achromatic and colored configurations of the Kanizsa type.…”

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confidence: 99%

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Asymmetrical contrast effects induced by luminance and color configurations

Dresp

Fischer

2001

Perception & Psychophysics

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Asymmetrical contrast effects induced by luminance and color configurations

Dresp

Fischer

2001

Perception & Psychophysics

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“…26,55,56 For simpler viewing conditions, Shevell and colleagues have also been able to demonstrate cases in which factors other than local contrast affect appearance. 38,39,57,58 C. Role of the Spatial Average A simple alternative to the idea that local contrast governs color appearance is that the visual system uses the spatial average of the cone photoreceptor responses to normalize its processing of color information. 22,24,43,44 This alternative does not require that local contrast be the key variable for predicting color appearance.…”

Section: B Role Of Local Contrastmentioning

confidence: 99%

Color constancy in the nearly natural image 2 Achromatic loci

1998

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Most empirical work on color constancy is based on simple laboratory models of natural viewing conditions. These typically consist of spots seen against uniform backgrounds or computer simulations of flat surfaces seen under spatially uniform illumination. In this study measurements were made under more natural viewing conditions. Observers used a projection colorimeter to adjust the appearance of a test patch until it appeared achromatic. Observers made such achromatic settings under a variety of illuminants and when the test surface was viewed against a number of different backgrounds. An analysis of the achromatic settings reveals that observers show good color constancy when the illumination is varied. Changing the background surface against which the test patch is seen, on the other hand, has a relatively small effect on the achromatic loci. The results thus indicate that constancy is not achieved by a simple comparison between the test surface and its local surround.

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“…For example, two circles of the same luminance appear to have different lightness if one is embedded in a dark surround and another in a bright surround. This phenomenon, which is called simultaneous lightness contrast, has been investigated extensively (e.g., Heinemann, 1955;Reid & Shapley, 1989;Shevell, Holiday, & Whittle, 1992). The simultaneous lightness contrast dramatically demonstrates the dissociation between the amount of light arriving at the retina and our perception.…”

Section: Discussionmentioning

confidence: 99%

Inter-trial effect in luminance processing revealed by Magnetoencephalography

Kondo

Watanabe

2013

Univ Psychol

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A b s t r A c tIn this study, we examined whether luminance processing in the human visual system would exhibit any history effect (i.e., inter-trial modulation) in psychophysical and magnetoencephalographic experiments. A disk was presented against a black background at various luminance levels in a randomized order. During the MEG recording, participants were instructed to rate the brightness of the disk (magnitude estimation) and to report it aloud during inter-stimulus interval. The MEG results showed that the neuromagnetic activation around 200-220 ms after the stimulus onset in the left occipitotemporal regions at a given trial was weaker when the disk luminance in the immediately prior trial was higher. An inverse inter-trial effect was also observed in the psychophysical experiment. These findings suggest that the neuromagnetic activity reflects the inter-trial modulation of luminance processing that correlates with the subjective perception of brightness. Keywords authors luminance, inter-trial effect, magnetoencephalography (MEG). Keywords plusPerception, occipito-temporal region, Cognitive Science. r e s u m e n En este estudio, se examinó si el procesamiento de iluminación en el sistema visual humano exhibie algún efecto de historia (es decir, modulación interensayo) en experimentos psicofísicos y de magnetoencefalografía (MEG). Un disco se presentó contra un fondo negro en varios niveles de iluminación en un orden aleatorio. Durante el registro de MEG, los participantes fueron instruidos para clasificar el brillo del disco (estimación de magnitud) y reportarlo durante el intervalo inter-ensayo. Los resultados de MEG mostraron que la activación neuromagnetica alrededor 200-220 ms después de la aparición de estímulo en las regiones occipito-temporal izquierda en un ensayo dade fue más débil cuando la iluminación de disco en el ensayo inmediatamente antes fue mayor. También se observó un efecto inverso inter-ensayo en el experimento psicofísico. Estos hallazgos sugieren que la actividad neuromagnética refleja la modulación inter-ensayo de procesamiento de iluminación que se correlaciona con la percepción subjetiva de brillo. Palabras clave autoresIluminación, efecto inter-ensayo, magnetoencefalografía (MEG). Palabras clave descriptoresPercepción, región occipito-temporal, ciencia cognitiva.

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Two separate neural mechanisms of brightness induction

Cited by 59 publications

References 13 publications

Asymmetrical contrast effects induced by luminance and color configurations

Asymmetrical contrast effects induced by luminance and color configurations

Color constancy in the nearly natural image 2 Achromatic loci

Inter-trial effect in luminance processing revealed by Magnetoencephalography

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