English: Fig. 2. Measuring input scale by action potential timing – a) shows the encoding neuron’s resting subthreshold oscillation in a solid line. Input currents alter the oscillation as shown by the dotted line, and thus make the encoding neuron reach its action potential threshold (depicted by the dashed straight line). In b) the dashed line still represents the encoding neuron’s action potential threshold. The dotted line shows the spiking behaviour of an encoding neuron upon a being stimulated by a threshold-reaching input. For both a) and b), the y-axis is voltage and the x-axis is time. Figure adapted from Hopfield, 1995.