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Fig 1 - Animal colour vision - Behavioural tests and physiological concepts

(A) Diagram of a four-stage model of colour discrimination by a trichromatic eye (modified from Brandt & Vorobyev, 1997). Stage 1 : responses of receptors (r, rh) sensitive to short (S), medium (M) and long (L) wavelengths of light, to reference and test stimuli. Stage 2 : achromatic and\or chromatic interactions between signals . Three mechanisms are needed to represent all the information (x " , x # , x $ , for the reference and x " , x # , x $ , for the test stimulus) encoded by three receptor types. Stage 3: ∆S represents the distance of the two stimuli in colour space, this distance depends on the metrics (see Figs 3, 4). At stage 4, either the test or the reference stimulus is selected with a probability P corr . (B) Model that does not include stage 2 mechanisms ; many models are of this type, see Figs 3B, C, 4C, and 5A, ii and iii.
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