Porciatti V, Fontanesi G, Bagnoli P
Department of Physiology and Biochemistry, University of Pisa, Italy.
Vision Res. 1989;29(12):1693-8. doi: 10.1016/0042-6989(89)90151-x.
Electroretinographic responses (ERGs) have been recorded from the cornea of the little owl (Athene noctua) in response to single light flashes and to alternating sinusoidal gratings (pattern) at different levels of light adaptation. Both flash- and pattern-evoked ERGs show scotopic as well as photopic components. The pattern evoked ERG is spatially tuned with tuning functions which shift towards lower frequencies by reducing the mean luminance. The retinal acuity is about 6 c/deg at 2.3 log cd/m2 and decreases progressively by reducing the mean luminance. No pattern ERG can be recorded beyond -6.7 log cd/m2 at any spatial frequency. The pattern ERG amplitude decreases progressively by reducing the contrast. The extrapolated contrast threshold is about 1%. Acuity and contrast sensitivity ERG values are in the range of those obtained by operant techniques in other species with duplex retinae such as owls and cats.
已从小猫头鹰（仓鸮）的角膜记录到视网膜电图反应（ERG），该反应是对不同光适应水平下的单次闪光和交替正弦光栅（图形）做出的。闪光诱发和图形诱发的ERG均显示出暗视和明视成分。图形诱发的ERG在空间上具有调谐功能，随着平均亮度降低，调谐功能向低频移动。在2.3 log cd/m2时，视网膜敏锐度约为6 c/deg，并随着平均亮度降低而逐渐下降。在任何空间频率下，超过-6.7 log cd/m2都无法记录到图形ERG。通过降低对比度，图形ERG振幅会逐渐减小。外推的对比度阈值约为1%。敏锐度和对比敏感度ERG值与通过操作性技术在其他具有双眼视网膜的物种（如猫头鹰和猫）中获得的值范围相同。
