Virsu V, Lee B B, Creutzfeldt O D
Exp Brain Res. 1977 Jan 18;27(1):35-50. doi: 10.1007/BF00234823.
The receptive fields of LGN cells were investigated with stationary light and dark spot and annulus stimuli. Stimulus size and background intensity were varied while stimulus/background contrast was kept constant. The speed of dark adaptation vaired considerably from cell to cell. Dark adaptation made responses more sustained in all neurones and eliminated the oscillatory on-responses evoked under some conditions in the light-adapted cells. Dark adaptation led also to a disappearance of early phasic inhibition in on-responses, and increased response rise time and latency. The power of surround responses to inhibit centre responses decreased slightly at low levels of light adaptation in LGN cells but much less than in retinal ganglion cells. Some other traces of changing retinal surround effects also appeared inthe LGN on dark adaptation. For example, the functional size of receptive fields increased at low levels of illuminance as has been observed in retinal ganglion cells and the receptive fields as estimated from response peaks were larger than those estimated from sustained components.
用静止的亮斑、暗斑及环形刺激研究了外侧膝状体（LGN）细胞的感受野。在保持刺激/背景对比度恒定的情况下，改变刺激大小和背景强度。暗适应的速度在细胞间有很大差异。暗适应使所有神经元的反应更持久，并消除了在某些条件下光适应细胞中诱发的振荡性开反应。暗适应还导致开反应中早期相位抑制的消失，并增加了反应上升时间和潜伏期。在LGN细胞中，低水平光适应时，周围反应抑制中心反应的能力略有下降，但比视网膜神经节细胞下降得少得多。在暗适应时，LGN中也出现了视网膜周围效应变化的其他一些迹象。例如，在低照度下，感受野的功能大小增加，这与在视网膜神经节细胞中观察到的情况一样，并且根据反应峰值估计的感受野比根据持续成分估计的感受野更大。
