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The contrast sensitivity function of a small cryptobenthic marine fish

机译：小碱基海洋鱼的对比度敏感功能

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Spatial resolution is a key property of eyes when it comes to understanding how animals' visual signals are perceived. This property can be robustly estimated by measuring the contrast sensitivity as a function of different spatial frequencies, defined as the number of achromatic vertical bright and dark stripe pairs within one degree of visual angle. This contrast sensitivity function (CSF) has been estimated for different animal groups, but data on fish are limited to two free-swimming, freshwater species (i.e., goldfish and bluegill sunfish). In this study, we describe the CSF of a small marine cryptobenthic fish (Tripterygion delaisi) using an optokinetic reflex approach. Tripterygion delaisi features a contrast sensitivity that is as excellent as other fish species, up to 125 (reciprocal of Michelson contrast) at the optimal spatial frequency of 0.375 c/degrees. The maximum spatial resolution is instead relatively coarse, around 2.125 c/degrees. By comparing our results with acuity values derived from anatomical estimates of ganglion cells' density, we conclude that the optokinetic reflex seems to be adapted to process low spatial frequency information from stimuli in the peripheral visual field and show that small marine fish can feature excellent contrast sensitivity at optimal spatial frequency.
机译：空间分辨率是在理解动物的视觉信号如何感知时眼睛的关键特性。通过测量作为不同空间频率的函数的对比度灵敏度，可以鲁棒地估计该特性，该特性定义为在一定程度的视角内的消色差垂直明亮和暗条纹对的数量。已经估计了这种对比度灵敏度函数（CSF）针对不同的动物组，但鱼类的数据仅限于两个自由游泳，淡水种类（即，金鱼和蓝鳃太阳鱼）。在这项研究中，我们描述了使用Optopetic Reflex方法描述了小型海洋阴道鱼（TripteryGion Delaisi）的CSF。 TripteryGion Delaisi具有与其他鱼类的相比敏感性，最高可达125（迈克森对比度），最佳空间频率为0.375℃/°。最大空间分辨率相反，相反粗糙，约为2.125 c /°。通过将结果与来自神经节细胞密度的解剖估计的解剖学估计结果进行比较，我们得出结论，视神经反射似乎适于从外围视野中的刺激处理低空间频率信息，并显示小型海洋鱼可以具有优异的对比度最佳空间频率的灵敏度。

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