Linking the computational structure of variance adaptation to biophysical mechanisms.
Linking the computational structure of variance adaptation to biophysical mechanisms.
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DOI:
10.1016/j.neuron.2011.12.029
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发表时间:
2012-03-08
期刊:
影响因子:
16.2
通讯作者:
Baccus SA
中科院分区:
文献类型:
--
作者:
Ozuysal Y;Baccus SA
In multiple sensory systems, adaptation to the variance of a sensory input changes the sensitivity, kinetics and average response over timescales ranging from < 100 ms to tens of seconds. Here we present a simple biophysically relevant model of retinal contrast adaptation that accurately captures both the membrane potential response and all adaptive properties. The adaptive component of this model is a first-order kinetic process of the type used to describe ion channel gating and synaptic transmission. From the model, we conclude that all adaptive dynamics can be accounted for by depletion of a signaling mechanism, and that variance adaptation can be explained as adaptation to the mean of a rectified signal. The parameters of the model show strong similarity to known properties of bipolar cell synaptic vesicle pools. Diverse types of adaptive properties that implement theoretical principles of efficient coding can be generated by a single type of molecule or synapse with just a few microscopic states.
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