NEURONAL DYNAMICS I:ACTIVATIONS AND SIGNALS NEURONS AS FUNCTIONS Neurons behave as functions. Neurons transduce an unbounded input activation x(t)at time t into a bounded output signal S(x(t)). 22 NEURONAL DYNAMICS Ⅰ: ACTIVATIONS AND SIGNALS NEURONS AS FUNCTIONS Neurons behave as functions. Neurons transduce an unbounded input activation x(t) at time t into a bounded output signal S(x(t))