Elsevier

Vision Research

Volume 14, Issue 9, September 1974, Pages 823-830
Vision Research

A spectral compensation method for determining the flicker characteristics of the human colour mechanisms

https://doi.org/10.1016/0042-6989(74)90147-3Get rights and content

Abstract

The modulation depth of a light of intensityI1, at wavelength λ1, and that of a light of intensityI2 at wavelength λ2 can be so chosen that a patch of light containing these two modulated monochromatic beams is “seen” as a steady field byone class of cones. This condition is reached if for one class of cones the increase in effective quantum catch due to an increase inI1, is compensated by an identical decrease inI2, and vice versa. Implicitly this stimulus is perceived as a modulated beam by another class of cones.

The silencing of either of the two classes of cones in the red-green spectral range by this spectral compensation method resulted in similar flicker fusion curves for both the “red” and “green” cones, granted identity in respective states of adaptation. Our results show that the isolated human medium and long wavelength cone systems do not exhibit low frequency attenuation even at retinal illuminations as high as 1250 td.

On peut choisir les profondeurs de modulation de lumières d'intensitéI1 et de longueur d'onde λ1, etI2 et λ2, de façon qu'un faisceau de lumière contenant ces deux radiations monochromatiques soit “vu” comme fusionnéparune des classes de coˆnes. Cette condition est atteinte si pour cette classe de coˆnes l'accroissement du nombre quantique effectif dûàune augmentation deI1, est compensépar une diminution identique pourI2, et vice versa. Implicitement ce stimulus est perçu comme un faisceau module par une autre classe de coˆnes.

Le silence d'une des deux classes de coˆnes dans le domaine spectral rouge-vert par cette méthode de compensation spectrale aboutitàdes courbes semblables pour la fusion du papillotement,àla fois pour les coˆnes “rouges” et “verts” si lesétats respectifs d'adaptation sont identiques. Nos résultats montrent que les systèmes humains isolés de coˆnes sensibles aux grandes et moyennes longueurs d'onde ne présentent pas d'atténuationàbasse fréquence meˆme pour deséclairement rétiniens atteignant 1250 td.

Die Modulationstiefe eines Lichts der IntensitätI1 und der Wellenlänge λ1 und die eines Lichts der IntensitätI2 und der Wellenlänge λ2 kann so gewählt werden, dass ein Lichtfleck, der diese beiden modulierten monochromatischen Bündel enthält, voneiner Klasse von Zapfen als ein gleichmässiges Feld “gesehen” wird. Diese Bedingung wird erfüllt, wenn für eine Klasse von Zapfen der Anstieg des effectiven Quanteneinfalls aufgrund eines Anstiegs vonI1 durch eine identische Abnahme vonI2 kompensiert wird- und umgekehrt. Von einer anderen Klasse von Zapfen wird dieser Reiz ohne weiteres als modulierter Strahl wahrgenommen.

Die Unterdrückung jeweils einer der zwei Klassen von Zapfen im rot-grünen Spektralbereich durch diese spektrale Kompensationsmethode hatteähnliche Flimmerverschmelzungskurven sowohl für die “roten” als auch für die “grünen” Zapfen-Identität der betreffenden Adaptationszustände vorausgesetzt. Unsere Ergebnisse zeigen, dass die isolierten mittel- und langwelligen Zapfensysteme des Menschen selbst bei einer Netzhautbeleuchtungsstärke von 1250 td keine niederfrequente Dämpfung zeigen.

Глyбниa мoдyляции cвeтa, имeющeгo интeнcивнocть T1 пpи длниe вoлны λ1 и тaкoвaя жe для cвeтa c интeнcивнocтью T2 пpи длинe вoлны γ2, мoжeт быть выбpaнa тaк, хтo пyхeк cвeтa, coдepжaщий зти двa мoдyлиpyeмыe мoнoхpoмaтихecкиe пyхкa лyхeй, “видитcя” oдним клaccoм кoлбoхeк кaк пocтoяннoe пoлe. Этo ycлoвиe дocтигaeтcя, ecли для oднoгo клacca кoлбoхeк yвeлихeниe эффeктивнoгo пoглoщeния квaнтoв, дaвaeмoe yвeлихeниeм T1, кoмпeнcиpyeтcя идeнтихным yмeньщeниeм T1 и vice-versa. Пoдpaзyмeвaeтcя, хтo этoт cтимyл вocпpинимaeтcя кaк мoдyлиpoвaнный лyх дpyгим клaccoм кoлбoхeк.

“Moлхaниe” oднoгo из двyх клaccoв кoлбoхeк в кpacнo-зeлeнoм диaпaзoнe cпeктpa, пpи иcпoльзoвaнии зтoгo мeтoдa cпeктpaльнoй кoмпeнcaции, пpoявляeтcя в cхoдных кpивых cлияния мeлькaний для oбeих “кpacнoй” и “зeлeнoй” кoлбoхeк, пpи дoпyщeнии идeнтихнocти cooтвeтcтвyющих cocтoяний aдaптaции, Haщи peзyльтaты пoкaзывaют, хтo oтдeльныe cpeднe-вoлнoвыe и длиннoвoлнoвыe кoлбoхкoвыe cиcтeмы хeлoвeкa нe oбнapyживaют иcтoщeния нa низких хacтoтaх дaжe пpи выcoких ocвeщeннocтях ceтхaтки, тaких кaк 1250 тpoлaндoв.

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