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Spike-Threshold Adaptation Predicted by Membrane Potential Dynamics In Vivo

Figure 7

Fit quality vs. threshold time constant.

To show that the optimized threshold time constant (about 260 ┬Ás on average) is accurate, we fitted the threshold model to the recordings while setting the time constant to a fixed value, i.e., the time constant is no longer a parameter to be optimized. The plots show the resulting gamma factor (in black, right ordinate) and explained variance (in red, left ordinate) as a function of threshold time constant for 9 cells. Moving the time constant away from its optimal value results in large increases in the fitting error.

Figure 7