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The results of the simulations are depicted in figure 21. In experiments A, B and C only the linear part of the stimulus-response characteristic is considered. In the graph, the crossing of the curves with the Y-axis represents the spontaneous activity of the system. 1 Figure 20. Stimulus response curve of the model afferent nerve. The slopes of the curves represent the sensitivity. The values for sensitivity and spontaneous activity of the 3 experiments are given in table 2. The entire tree with all synapses, as simulated in experiment A is the most sensitive (472 Hz/nA).
J Gen Physiol 73, 685-702. Connor, J. A. and Stevens, C. F. (1971). Prediction of repetitive firing behaviour from voltage clamp data on an isolated neurone soma. J Physiol 213, 31-53. Coulter, D. A. and Lee, C. J. (1993). Thalamocortical rhythm generation in vitro: extraand intracellular recordings in mouse thalamocortical slices perfused with low Mg2+ medium. Brain Res 631, 137-42. Daw, N. , Stein, P. S. and Fox, K. (1993). The role of NMDA receptors in information processing. Annu Rev Neurosci 16, 207-22.
Gating properties of INa in the spike generator. Spike frequency is depicted in gray, the INa h-gating in black. A low value of h means high inactivation. The strong stimulus prevents removal of the inactivation. This leads to a decrease in spike amplitude. 51 In order to test the effects of a reduced number of inputs on the sensitivity, we simulated 3 experiments with different geometrical parameters. The first experiment (A) is similar to the results we already showed, it represents the entire dendritic tree, with at every terminal a sinusoidal I-Clamp to simulate a synapse.