Light adaptation of primate cones: An analysis based on extracellular data

Valeton, J. M.; Norren, Dirk van

doi:10.1016/0042-6989(83)90167-0

Cited by 186 publications

(153 citation statements)

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“…The aware͞unaware (A͞U) scores for the red and the green stimuli employed are given in the Insets. (18,19). A shows in green and red the stimulus input to the M-cone (middle wavelength-sensitive), and L-cone (long wavelength-sensitive) receptors, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…To achieve isoluminance, the complementary L (long wavelength) signals are modulated correspondingly below the background signal level, so that the sum of L-cone and M-cone signals remains unchanged (17). The increased stimulation of M-cones and the corresponding decreased stimulation of L-cones will cause an opposite shift in the cellular adaptation of these receptors (18,19). This adaptation predicts a decrease in the mean signal level of M-receptors and a corresponding increase in the L-receptor responses, without disturbing isoluminance (Fig.…”

Section: Resultsmentioning

confidence: 99%

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The unseen color aftereffect of an unseen stimulus: Insight from blindsight into mechanisms of color afterimages

Barbur

Weiskrantz

Harlow

1999

Proc. Natl. Acad. Sci. U.S.A.

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We show here that, in the absence of a direct geniculostriate input in human subjects, causing loss of sight in the visual half-field contralateral to the damage, the pupil responds selectively to chromatic modulation toward the long-wavelength (red) region of the spectrum locus even when the stimulus is isoluminant for both rods and cones and entirely restricted to the subjects' ''blind'' hemifields. We also show that other colors are less or wholly ineffective. Nevertheless, red afterimages, generated by chromatic modulation toward the green region of the spectrum locus, also cause constrictions of the pupil even when green stimuli are themselves completely ineffective in the blind hemifield. Moreover, human subjects with damage to or loss of V1 are typically completely unaware of the stimulus that generates the aftereffect or of the aftereffect itself, both of which can be seen clearly in normal vision. The results show that pupillary responses can reveal the processing of color afterimages in the absence of primary visual cortex and in the absence of acknowledged awareness. This phenomenon is therefore a striking example of ''blindsight'' and makes possible the formulation of a model that predicts well the observed properties of color afterimages.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The unseen color aftereffect of an unseen stimulus: Insight from blindsight into mechanisms of color afterimages

Barbur

Weiskrantz

Harlow

1999

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…Whenever a retinal cell is presented with a temporally constant stimulus, its response progressively diminishes, even for those retinal cells that are termed tonic because of their relatively long-lasting response. This adaptation to constant illumination starts as early as in light receptors, that display a complicated non-linear adaptation to light levels, within the order of a second [27,30].…”

Section: Slow Cellular Adaptationmentioning

confidence: 99%

Virtual Retina: A biological retina model and simulator, with contrast gain control

2008

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“…(1) for the M-cone and similarly for responses V L and V S of the two other cone types. The exponent n is allowed to vary between 0.7 and 1.0 (Valeton & van Norren, 1983). σ is the half-saturation constant (a parameter that is interpreted as a sensitivity measure) with a different value for each cone type.…”

Section: A Physiological Model Of Color Visionmentioning

confidence: 99%

Neurophysiological correlates of color vision: A model.

Valberg¹,

Seim²

2013

Psychology & Neuroscience

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The tree-receptor theory of human color vision accounts for color matching. A bottom-up, non-linear model combining cone signals in six types of cone-opponent cells in the lateral geniculate nucleus (LGN) of primates describes the phenomenological dimensions hue, color strength, and lightness/brightness. Hue shifts with light intensity (the Bezold-Brücke phenomenon), and saturation (the Abney effect) are also accounted for by the opponent model. At the threshold level, sensitivities of the more sensitive primate cells correspond well with human psychophysical thresholds. Conventional Fourier analysis serves well in dealing with the discrimination data, but here we want to take a look at non-linearity, i.e., the neural correlates to perception of color phenomena for small and large fields that span several decades of relative light intensity. We are particularly interested in the mathematical description of spectral opponency, receptive fields, the balance of excitation and inhibition when stimulus size changes, and retina-to-LGN thresholds.

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Light adaptation of primate cones: An analysis based on extracellular data

Cited by 186 publications

References 20 publications

The unseen color aftereffect of an unseen stimulus: Insight from blindsight into mechanisms of color afterimages

The unseen color aftereffect of an unseen stimulus: Insight from blindsight into mechanisms of color afterimages

Virtual Retina: A biological retina model and simulator, with contrast gain control

Neurophysiological correlates of color vision: A model.

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