Fig. 2 | Nature Communications

Fig. 2

From: Optimal solid state neurons

Fig. 2

Twin experiment with a solid-state neuron. a Membrane voltage of a sub-threshold neuron (black line) stimulated by a current protocol mixing hyperchaotic oscillations with current steps (blue line). The membrane voltage was measured from a VLSI chip implementing the NaKL SSN model. The SSN model was synchronized to the data over a T = 600-ms-long assimilation window (green line). The complete model configured with the estimated parameters was then forward integrated from t = 600 ms onwards to t = 2000 ms to predict the membrane voltage (red line). b Membrane voltage predicted by the completed SSN model for a different current protocol consisting of fast and slow-varying steps (red line). VLSI membrane voltage measured on the VLSI neuron (black line). c Detail of membrane voltage oscillations showing the shape of predicted and actual action potentials. d Predicted time dependence of state variables \(V\), \({V}_{m}\), \({V}_{h}\) and \({V}_{n}\). e Phase portrait of action potentials over the assimilation window: VLSI experiment (black line), fitted (green line) and predicted from t = 0 (red line).

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