Looking at the Nengo code base, it looks like
input is the (combined) post-synaptic current
J being fed into the neuron non-linearity.
step function of the
LIF provides an example of how this input current is put through the neuron non-linearity to calculate the neuron membrane voltage, which then determines if the neuron has spiked or not.
EDIT: Just a point of clarification, when you probe the
.neurons attribute of an ensemble, you are getting at the properties associated with the individual neurons in the ensemble. However, if you are just probing the ensemble (e.g,
nengo.Probe(net.ens)), you’ll be probing the properties associated with the ensemble as a whole.