p063fig02.09 The Additive Model describes how multiple effects add up influence the activities, or STM, traces of neurons.<BR>||  STM: Additive model (Grossberg, PNAS 1967, 1968). <TABLE border="1"><TR><TD>Short-term memory (STM)<BR>trace activation</td><TD>signal</td><TD>adaptive weight</td><TD>Long-term memory (LTM)<BR>trace</td></tr><TR><TD>xi(j)</td><TD>fi(xi(t))*Bij</td><TD>zij(t)</td><TD>xj(t)</td></tr></table><TABLE border="1"><TR><TD>learning rate?</td><TD>passive decay</td><TD>positive feedback</td><TD>negative feedback</td><TD>input</td></tr><TR><TD>d[dt: xi(t)] =</td><TD> - Ai*xi</td><TD> + sum[j=1 to n: fj(xj(t))*Bji*zji]</td><TD> - sum[j=1 to n: gj(xj)*Cp*Zp]</td><TD> + Ii</td></tr></table>Special case : d[dt: xi(t)] = - Ai*xi + sum[j=1 to n: fj(xj(t))*zp] + Ii