Fig. 3.

Resetting of the spike train in the model neuron. Each set of traces shows the membrane potential of the model neuron together with the concentrations of ATP, ADP, AMP, and adenosine (ADO). With K_i set to 2 μm, an accommodating train of spikes lasting ∼4 sec was evoked by current injection into the neuron (top trace). In the bottom sets oftraces, a second shorter current pulse was injected (*) during the first. Note that the total duration of spiking was prolonged compared with the control (middle two traces). If the second current pulse occurred past a certain time, the train was prematurely terminated (bottom trace).