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• W2015505597 abstract "The visual cortex responds to repeated presentations of the same stimulus with high variability. Because the firing mechanism is remarkably noiseless, the source of this variability is thought to lie in the membrane potential fluctuations that result from summated synaptic input. Here this hypothesis is tested through measurements of membrane potential during visual stimulation. Surprisingly, trial-to-trial variability of membrane potential is found to be low. The ratio of variance to mean is much lower for membrane potential than for firing rate. The high variability of firing rate is explained by the threshold present in the function that converts inputs into firing rates. Given an input with small, constant noise, this function produces a firing rate with a large variance that grows with the mean. This model is validated on responses recorded both intracellularly and extracellularly. In neurons of visual cortex, thus, a simple deterministic mechanism amplifies the low variability of summated synaptic inputs into the large variability of firing rate. The computational advantages provided by this amplification are not known." @default.
• W2015505597 created "2016-06-24" @default.
• W2015505597 creator A5026654708 @default.
• W2015505597 date "2004-08-24" @default.
• W2015505597 modified "2023-10-03" @default.
• W2015505597 title "Amplification of Trial-to-Trial Response Variability by Neurons in Visual Cortex" @default.
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• W2015505597 doi "https://doi.org/10.1371/journal.pbio.0020264" @default.
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