arXiv:2611.06822v1 Announce Type: new Abstract: What is the threshold of an excitable system, i.e. the criterion that distinguishes rest from excitation? Previous research has shown that this question is far from trivial to answer. This paper studies the threshold of a simple excitable primitive in which excitability arises from the positive feedback interconnection of a first-order high-pass filter and a static, strictly monotone and strictly convex activation function. This threshold is a simple inequality on the difference between the instantaneous input and the motif's internal memory. While this result may help neuro-engineers characterize spiking in biological and artificial neurons, we argue that excitability is not always a desirable property, and that our threshold may also be relevant to safety considerations in fragile systems with rate-induced tipping points. We illustrate our framework with three examples: the FitzHugh-Nagumo model of neuronal dynamics, a model of stop-loss cascades in the stock market, and a social contagion model.