Adaptation to background light enables contrast coding at rod bipolar cell synapses.
Adaptation to background light enables contrast coding at rod bipolar cell synapses.
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DOI:
10.1016/j.neuron.2013.10.054
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发表时间:
2014-01-22
期刊:
影响因子:
16.2
通讯作者:
Singer JH
中科院分区:
文献类型:
--
作者:
Ke JB;Wang YV;Borghuis BG;Cembrowski MS;Riecke H;Kath WL;Demb JB;Singer JH
Rod photoreceptors contribute to vision over a ~6 log-unit range of light intensities. The wide dynamic range of rod vision is thought to depend upon light intensity-dependent switching between two parallel pathways linking rods to ganglion cells: a rod→rod bipolar (RB) cell pathway that operates at dim backgrounds and a rod→cone→cone bipolar cell pathway that operates at brighter backgrounds. We evaluated this conventional model of rod vision by recording rod-mediated light responses from ganglion and AII amacrine cells and by recording RB-mediated synaptic currents from AII amacrine cells in mouse retina. Contrary to the conventional model, we found that the RB pathway functioned at backgrounds sufficient to activate the rod→cone pathway. As background light intensity increased, the RB’s role changed from encoding the absorption of single photons to encoding contrast modulations around mean luminance. This transition is explained by the intrinsic dynamics of transmission from RB synapses.
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DOI:
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