System-Size Induced Coherence Resonance in Coupled Minimal Cytosolic Ca²⁺ Oscillation Models

We have investigated the collective behaviour of an array of coupled minimal cytosolic Ca²⁺ oscillation models by numerical methods, taking into account the external noise resulting from the random extracellular stimulation. It is found that the system size, i.e. the number of minimal cytosolic Ca²⁺ oscillation models, has an optimal value, at which the system collective dynamics shows the best performance. The effect of the coupling strength has also been studied. Such a phenomenon of system-size resonance has been found for different coupling strengths, but the optimal system size increases when the coupling strength increases.