Photoreceptor encoding of supersaturating light stimuli in salamander retina.
Photoreceptor encoding of supersaturating light stimuli in salamander retina.
复制标题
蝾螈视网膜中过饱和光刺激的感光编码。
DOI：
10.1113/jphysiol.2005.092239
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Slaughter,MalcolmM
中科院分区：
文献类型：
--
作者：
Xu,JianWei;Hou,Mingli;Slaughter,MalcolmM
在适应黑暗的蝾螈视网膜中，在正常生理条件下杆状细胞可以产生尖刺。在对饱和光反应的恢复阶段，杆状细胞中观察到Spike活性。这些动作电位是钙峰值，被镉和L型钙通道阻滞剂阻断。当光刺激使杆峰反应饱和时，钙动作电位的延迟发生取决于光强度，强光会增加峰延迟。因此，在超过杆饱和度的光强下，这些尖峰编码杆视觉信息。二阶和三阶神经元的突触后电流具有相似的时间过程。由于杆状体暴露在较亮的光刺激下产生了更多延迟的尖峰活动，这些信号可能导致负后像。
In the dark‐adapted salamander retina, spikes could be elicited from rods under normal physiological conditions. Spike activity was observed in rods during the recovery phase of the response to saturating light. These action potentials were calcium spikes, blocked by cadmium and L‐type calcium channel blockers. In response to light stimuli that saturate the rod peak response, calcium action potentials occurred with a delay that depended on light intensity, with stronger light increasing spike latency. Therefore, these spikes encode rod visual information at light intensities beyond rod saturation. Postsynaptic currents of similar time course were observed in second and third order neurones. Since rods exposed to brighter light stimuli produced more delayed spike activity, these signals might contribute to negative afterimages.