Howard C M, Tregear S J, Werner J S
Link Simulation and Training Division, L-3 Communications, 6030 S. Kent, 85212-6061, Mesa, AZ, USA.
Vision Res. 2000;40(22):3059-64. doi: 10.1016/s0042-6989(00)00153-x.
The time course of recovery of spatial resolution following adaptation to a uniform field was measured for test probes presented at lower illuminance than the adapting field. Six observers were tested in a Maxwellian-view system using 20 degrees adapting fields of 1.6-2.6 log photopic trolands. Test stimuli were 7 degrees, 250 ms Gabor patches (1 and 6 cpd) of mean retinal illuminance 2-3 log units lower than the adapting field. During the 9 s after adapting field offset, contrast thresholds for orientation discrimination followed an exponential-decay function and showed longer recovery times for larger illuminance decrements and higher spatial frequency.
对于呈现出比适应场更低照度的测试探针，在适应均匀场后测量其空间分辨率恢复的时间进程。六名观察者在麦克斯韦观察系统中接受测试，使用1.6 - 2.6对数光视度特罗兰的20度适应场。测试刺激为7度、250毫秒的高斯包络调制正弦波光栅（1和6周/度），其平均视网膜照度比适应场低2 - 3对数单位。在适应场消失后的9秒内，方向辨别对比度阈值遵循指数衰减函数，并且对于更大的照度衰减和更高的空间频率，显示出更长的恢复时间。
