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Extra resources for Mechanisms of Colour Discrimination. Proceedings of an International Symposium on the Fundamental Mechanisms of the Chromatic Discrimination in Animals and Man Held in Paris at the Collège de France, 25–29 July 1958

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Et biol animale, 14, Sér. Il, 439-447. t WALTHER, J. B. (1958) Z. Ins. , 2, 142-151. 35 Über den Farbensinn der Insekten compound eye can be made exactly congruent in form by modification of the intensity of the light stimulus used (Fig. 4). However, this is not the case for the Stim Stim LAX10 DA V. R DA V. 6,R FIG. 4. Typical shape of the potentials from the lower part of the compound eye of Periplaneta americana (cockroach); stimulation by different colours following dark adaptation (DA), and their change through light adaptation (LAA) to monochromatic light of wavelength λ.

Le sens chromatique de l'Ecureuil vulgaire vient d'être démontré récemment par des expériences de MeyerOehme (1957) qui a adapté à cette espèce la technique du jumping-apparatus de Lashley; l'Ecureuil vulgaire distingue bien quatre couleurs au moins: rouge, jaune, vert et bleu. Quant au Spermophile, nous savons seulement, d'après Kolosvary (1934) qu'il semble distinguer le bleu du rouge. Des expériences portant sur cette espèce sont actuellement en cours au Laboratoire de Psychologie animale de Strasbourg.

Ainsi la Crevette Hippolyte varians cherche un abri sous des algues de la couleur de son corps — les individus bruns sous les algues brunes, les individus verts sous les algues vertes —parce que ces algues forment un filtre de radiations. Cette réaction est une simple réaction de défense contre l'action 44 Inventaire Zoologique de la lumière et ne prouve absolument pas la perception de qualités chromatiques. (b) La méthode des réflexes oculo-moteurs, préconisée par von Buddenbrock (1927); elle consiste à produire chez l'animal étudié un nystagmus optocinétique, en le plaçant au centre d'un tambour tournant portant des bandes verticales colorées.

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