3.2 ADDITIVE NEURONAL DYNAMICS first-order passive decay model In the absence of external or neuronal stimuli, the simplest activation dynamics model is: xi=一xi (3-3) (3-4) 2006.10.92006.10.9 In the absence of external or neuronal stimuli, the simplest activation dynamics model is: i xi = −x • y j = −yj • 3.2 ADDITIVE NEURONAL DYNAMICS (3-3) (3-4) ◆ first-order passive decay model