Gover Nick, Jarvis John R, Abeyesinghe Siobhan M, Wathes Christopher M
The Royal Veterinary College, University of London, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire AL9 7TA, UK.
Vision Res. 2009 Nov;49(23):2747-53. doi: 10.1016/j.visres.2009.08.011. Epub 2009 Aug 14.
The luminance dependence of spatial acuity in domestic fowl was measured directly over stimulus luminances ranging from 0.06 to 57.35 cd m(-2). At the highest luminance, acuity was around 6.5 c deg(-1), in agreement with previous studies in this species. As stimulus luminance decreased, acuity fell with increasing rate to 3.2 c deg(-1) at 0.06 cd m(-2), following the same shape as acuity functions for other mammalian and avian species. These findings suggest that the rod-cone transition for domestic fowl is between 0.45 and 1.79 cd m(-2). Over the photopic range from 1.79 to 57.35 cd m(-2) the change of acuity for fowl was 1%, compared with 32% for humans. For domestic fowl, the Rovamo-Barten MTF model of contrast sensitivity accounted for the behaviour of acuity as a function of luminance down to mesopic levels.
在家禽中，直接测量了空间视敏度在0.06至57.35 cd m(-2)的刺激亮度范围内的亮度依赖性。在最高亮度下，视敏度约为6.5 c deg(-1)，与该物种先前的研究结果一致。随着刺激亮度降低，视敏度以增加的速率下降，在0.06 cd m(-2)时降至3.2 c deg(-1)，其形状与其他哺乳动物和鸟类物种的视敏度函数相同。这些发现表明，家禽的视锥 - 视杆细胞转换发生在0.45至1.79 cd m(-2)之间。在1.79至57.35 cd m(-2)的明视范围内，家禽视敏度的变化为1%，而人类为32%。对于家禽，对比度敏感度的Rovamo - Barten MTF模型解释了视敏度作为亮度函数直至中间视觉水平的行为。
