PLOS ONE2014-05-05 5:54 PM

以三种行为模式作为标识的小袋鼠的双色色觉 Dichromatic Colour Vision in Wallabies as Characterised by Three Behavioural Paradigms

论文摘要
尽管缺乏有关任何澳洲有袋动物视网膜中第三锥视蛋白的基因证据,然而目前为止大多数物种的第三锥视蛋白经过测试都似乎是三基色。基于此我们重新检验了此前已被确认为二原色视者的尤金袋鼠的色觉。基于操作性条件反射模式的三种不同心理测试被用来证实袋鼠的色觉可以仅由两个圆锥体类型的存在来预测和解释。首先,混色实验揭示了LCD显示器三原色之间的混乱点,这可以通过对短期和中等波长敏感的视锥细胞的圆锥励磁比率得到预测。其次,小袋鼠在单色刺激试验中表现出的波长辨别能力限制在440纳米和500纳米之间的较窄范围内。最后,测试袋鼠在白光中辨别单色光能力的实验设计明确证实了大约485纳米的中性点,该中性点始终无法被辨别。相对颜色辨别似乎被明确选择,但袋鼠的绝对颜色辨别能力仍可能被培养。该结果证实了尤金袋鼠是二原色视者且是迄今为止唯一从行为上被证实的澳大利亚有袋动物类二原色视者。

Abstract
Despite lacking genetic evidence of a third cone opsin in the retina of any Australian marsupial, most species tested so far appear to be trichromatic. In the light of this, we have re-examined colour vision of the tammar wallaby which had previously been identified as a dichromat. Three different psychophysical tests, based on an operant conditioning paradigm, were used to confirm that colour perception in the wallaby can be predicted and conclusively explained by the existence of only two cone types. Firstly, colour-mixing experiments revealed a Confusion Point between the three primary colours of a LCD monitor that can be predicted by the cone excitation ratio of the short- and middle-wavelength sensitive cones. Secondly, the wavelength discrimination ability in the wallaby, when tested with monochromatic stimuli, was found to be limited to a narrow range between 440 nm and 500 nm. Lastly, an experiment designed to test the wallaby’s ability to discriminate monochromatic lights from a white light provided clear evidence for a Neutral Point around 485 nm where discrimination consistently failed. Relative colour discrimination seemed clearly preferred but it was possible to train a wallaby to perform absolute colour discriminations. The results confirm the tammar wallaby as a dichromat, and so far the only behaviourally confirmed dichromat among the Australian marsupials.

KEYWORDS

SHARE & LIKE

COMMENTS

ABOUT THE AUTHOR

PLOS ONE

0 Following 5 Fans 0 Projects 90 Articles

SIMILAR ARTICLES

AbstractAgencies that fund scientific research must choose: is it more effective to give large grants to a few elite researchers, or small grants to ma

Read More

Abstract The role of genetically modified (GM) crops for food security is the subject of public controversy. GM crops could contribute to food product

Read More

Abstract 论文摘要 Background Combination antiretroviral therapy (ART) has significantly increased survival among HIV-positive adults in the United State

Read More

AbstractThe U.S. National Institutes of Health (NIH) budget expansion from 1998 through 2003 increased demand for biomedical research, raising relative

Read More

Abstract Kawaii (a Japanese word meaning “cute”) things are popular because they produce positive feelings. However, their effect on behavior remains

Read More

Abstract The diversity of life is one of the most striking aspects of our planet; hence knowing how many species inhabit Earth is among the most funda

Read More

Abstract Lateralized brain regions subserve functions such as language and visuospatial processing. It has been conjectured that individuals may be le

Read More

Abstract Background and Aims Questions over the clinical significance of cannabis withdrawal have hindered its inclusion as a discrete cannabis ind

Read More