Fish use colour to learn compound visual signals
Fish use colour to learn compound visual signals
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DOI：
10.1016/j.anbehav.2017.01.003
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发表时间：
2017-03-01
期刊：
影响因子：
2.5
通讯作者：
Cheney, Karen L.
中科院分区：
文献类型：
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作者：
Newport, Cait;Green, Naomi F.;Cheney, Karen L.
动物所呈现的颜色模式通常包含多种要素，包括色调、图案、亮度和质地。捕食者对视觉刺激的感知和学习对动物体色的进化具有重要意义，包括警戒色和拟态。本研究调查了一种珊瑚礁鱼类，即刺尾鱼（Rhinecanthus aculeatus）是如何学习颜色模式的不同要素的。经过训练能将食物奖励与灰色背景上的蓝色、黄色和绿色图案相关联的鱼，是通过色度而非图案或亮度对比来选择新的刺激物。相比之下，当呈现小的橙色斑点时，鱼似乎是学习亮度，这与其他动物（包括蜜蜂、鸟类和人类）的研究结果一致，即对于小物体，信号的无色成分比色度更显著。虽然在前两个实验中内部图案似乎没有被学习到，但随后的一项测试表明，鱼能够区分不同大小的斑点和条纹图案，直至其视力极限。这些结果结合颜色模式的视觉处理以及海洋环境中视觉信号的进化进行了讨论。（C）2017由爱思唯尔有限公司代表动物行为研究协会出版。
Colour patterns displayed by animals frequently comprise multiple elements, including hue, pattern, luminance and texture. Predators' perception of and learning about visual stimuli has important implications for the evolution of animal coloration, including aposematism and mimicry. This study investigated how a coral reef fish, the triggerfish Rhinecanthus aculeatus, learnt different elements of colour patterns. Fish trained to associate a food reward with blue, yellow and green patterns on a grey background selected novel stimuli by chromaticity, rather than pattern or luminance contrast. By comparison, when presented with small orange spots the fish appeared to learn luminance, which is consistent with findings in other animals, including bees, birds and humans, that for small objects the achromatic component of the signal is more salient than chromaticity. While internal pattern did not appear to be learnt in our first two experiments, a subsequent test showed that fish could distinguish between spotted and striped patterns over various sizes, up to the limits of their visual acuity. These results are discussed in relation to visual processing of colour patterns and the evolution of visual signals in the marine environment. (C) 2017 Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour.