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- W2093801620 abstract "Abstract The photopic sensitivity of rudd ( Scardinius erythrophthalmus ) to various monochromatic stimuli was measured, using a classical conditioning paradigm in which the unconditioned stimulus was shock, and the conditioned stimulus an increase in swimming activity. The stimuli were presented above the animals in all cases. An action spectrum obtained with moving bar stimuli of approximately 4.75° width showed a maximum near 630 nm. Chromatic adaptation showed that more than one spectral class of receptor contributed to these results. With diffuse light stimuli the absolute sensitivity was greatly decreased, and the form of the action spectrum was also different, showing in particular a marked region of insensitivity near 600 nm. Tests with moving and stationary 610nm bars of various sizes showed that the sensitivity was greatest when the width of the stimulus was between 3° and 5°, falling off for both bigger and smaller stimuli, and was unaffected by movement. The data can be largely interpreted in terms of known properties of fish retinal ganglion cells. It is assumed that the diffuse stimuli invade the inhibitory surrounds of the ganglion cells, reducing sensitivity and allowing chromatic interactions to take place. Behavioural determinations of the spectral sensitivity of the rudd to monochromatic stimuli superimposed on tungsten light backgrounds have now been carried out in four different ways, and the resulting spectral sensitivity curve is different in each case. Possible causes and consequences of these differences are considered." @default.
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- W2093801620 date "1974-07-01" @default.
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- W2093801620 title "Effects of stimulus size on spectral sensitivity in a fish (Scardinius erythrophthalmus), measured with a classical conditioning paradigm" @default.
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- W2093801620 doi "https://doi.org/10.1016/0042-6989(74)90039-x" @default.
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