  We consider an array of inductively coupled Josephson junctions with a fast
impurity (a junction with a smaller value of critical current), and study the
consequences of imposing a small amplitude periodic signal at some point in the
array. We find that when external signal is imposed at the impurity, the
response of the array is boosted and a small amplitude signal can be detected
throughout the array. When the signal is imposed elsewhere, minor effects is
seen on the dynamics of the array. The same results have been also seen in
presence of a single fast spiking neuron in a chain of diffusively coupled
FitzHugh-Nagumo neurons.
