Reconstruction of equidistant color space from responses of visual neurones of macaques

Valberg, Arne; Seim, Turid Karlsen; Lee, B. B.; Tryti, J.

doi:10.1364/josaa.3.001726

Cited by 82 publications

(42 citation statements)

References 19 publications

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“…AM/L cells do not operate along the axis required of a Hering type, red-green opponent channel, and although phasic cells may be involved in some detection tasks, their phasic responses and limited dynamic range make them unsuitable as a counterpart for an achromatic brightness channel. It is possible to reconstruct colour scaling systems quite well, however, assuming a linear combination of opponent cell outputs alone (Valberg et al 1986b). …”

Section: Discussionmentioning

confidence: 99%

Thresholds to chromatic spots of cells in the macaque geniculate nucleus as compared to detection sensitivity in man.

Crook¹,

Lee²,

Tigwell³

et al. 1987

The Journal of Physiology

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SUMMARY1. The relation between wavelength and psychophysical threshold for chromatic spots on a white background provides evidence for the existence of chromatic channels in the primate visual system. To find the physiological substrate of this task, we compared increment thresholds of different cell types in the macaque lateral geniculate nucleus with human psychophysical thresholds to the same stimuli, using two spot sizes, 4 and 0 4 deg.2. At different wavelengths, different opponent cell classes in the parvocellular layers of the nucleus were most sensitive, so that at long wavelengths (> 600 nm) red on-centre cells were most sensitive, while at short wavelengths (< 500 nm) S-cone, blue on-centre cells were most sensitive, from 500 to about 550 nm green on-centre cells being most sensitive. A rare cell type with inhibition from S-cones was most sensitive at about 570 nm, although its maximum contrast increment sensitivity was poor compared with that of other cell types. Variation in strength of cone opponency caused a considerable range in threshold in each of the opponent cell classes of the parvocellular layers.3. On-and off-centre cells from the magnocellular layers were more sensitive than opponent cells to white and yellow spots (as is the case with achromatic gratings).4. With different wavelengths and spot sizes, the most sensitive cells found approached (to within 0-1-0-3 log units) human psychophysical sensitivity, suggesting that the most sensitive cells available may underlie detection.5. Measurements of psychophysical chromatic discrimination thresholds, both with nearly monochromatic spots and with spots of differing saturation (purity), support this hypothesis. When magnocellular cell sensitivity corresponded to psychophysical threshold, a suprathreshold stimulus, capable of activating opponent cells, was required for chromatic discrimination.

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Section: Discussionmentioning

confidence: 99%

Thresholds to chromatic spots of cells in the macaque geniculate nucleus as compared to detection sensitivity in man.

Crook¹,

Lee²,

Tigwell³

et al. 1987

The Journal of Physiology

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“…Våre målinger av aktiviteten til opponente celler i netthinnen og i knekroppen (LGN, en kjerne midt mellom netthinnen og det visuelle korteks) til makakkapen (macaca fascicularis) la grunnlaget for en fysiologisk modell for fargesyn. Denne modellen kombinerte reaksjonen til de tappe-opponente cellene i LGN til nevral aktivitet som ga meningsfylte samsvar med psykofysiske data, og som en derfor kunne forestille seg forekom på høyere hjernenivå (Valberg et al, 1986a;Lee et al, 1987;Lee et al, 1988;Valberg & Seim, 2008). Det viste seg blant annet at mange psykofysiske terskler samsvarte med terskelfølsomheten til de mest følsomme cellene.…”

Section: Samvariasjon Mellom Persepsjon Og Nevrale Prosesserunclassified

Colour vision: From sensation to science (in Norwegian)

Valberg

2022

Scand J Optom Vis Sci

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Seksjon for biofysikk og medisinsk teknologi, Norges teknisk-naturvitenskapelige universitet, 7491 Trondheim, Norge SammendragOpp igjennom tidene har det vaert mange forskjellige teoretiske tilnaerminger til forståelsen av farger og fargesyn, avhengig av hvilke fenomener en ønsket å forklare. Isaac Newton analyserte fargespekteret og utførte omfattende studier av sammenhengen mellom fargefenomenet og optiske (fysiske) prosesser. De tilsynelatende uforenlige tre-og fire-fargeteoriene til henholdsvis YoungHelmholtz og Ewald Hering belyste ulike sider ved fargepersepsjon. I dag ser vi at både Thomas Young og Hermann von Helmholtz ønsket å si noe om fargekvaliteter, men med hjelp av James Clerk Maxwell ble tre-fargeteorien etter hvert redusert til en tre-reseptorteori som beskriver additive fargeblandinger og fargelikheter (fargematcher). Den opprinnelige tre-fargeteorien, med primaerfargene rød, grønn og fiolett, hadde vist seg å vaere en blindvei. Tre-reseptorteorien derimot skulle vise seg å vaere meget fruktbar. Den la grunnlaget for fysiske, trikromatiske fargemålinger i CIE-systemet og en avansert fargeteknologi. Ewald Hering synes å ha innsett at det var nødvendig å skille mellom persepsjon og reseptorstimuleringer, og hans opponent-fargeteori involverte nevrale prosesser som grunnleggende for de fire elementaere fargekvalitetene gul, rød, blå og grønn. I dag er det generell enighet om at fargene verken har sete i tappene selv eller i de etterfølgende tappe-opponente cellene i netthinnen og i knekroppen (eng.: lateral geniculate nucleus eller LGN). I lys av et manglende samsvar mellom aktiviteten til tappe-opponente celler hos primater og persepsjonen av elementaerfargene, er det blitt enda mer interessant å finne ut av organiseringen og behandlingen av de nervesignalene som korrelerer med fargepersepsjonen på høyere nivå i hjernen.Nøkkelord:

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“…was invited to join this team. Our recordings from opponent cells in the retina and lateral geniculate nucleus (LGN) of the macaque monkey (Macaca fascicularis) led to a physiological model of color vision that accounts for several color phenomena and psychophysical data (Valberg et al, 1986a;Lee et al 1987).…”

Section: Introductionmentioning

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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Reconstruction of equidistant color space from responses of visual neurones of macaques

Cited by 82 publications

References 19 publications

Thresholds to chromatic spots of cells in the macaque geniculate nucleus as compared to detection sensitivity in man.

Thresholds to chromatic spots of cells in the macaque geniculate nucleus as compared to detection sensitivity in man.

Colour vision: From sensation to science (in Norwegian)

Neurophysiological correlates of color vision: A model.

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