p064fig02.11 Medium-Term Memory (MTM) and Long-Term Memory (LTM) equations complement the Additive and Shunting Models of STM. MTM is typically defined by a chemical transmitter that is released from the synaptic knobs of a neuron (<A HREF="images- Grossberg 2021/p057fig02.03 neuron basic [anatomy, physiology].png">Figure 2.03</a>). Its release or inactivation in an activity-dependent way is also called habituation. LTM defines how associative learning occurs between a pair of neurons whose activities are approximately correlated through time.  See the text for details.<BR>||  Medium and Long Term memory.<TABLE border="1"><TR><TD>MTM</td><TD>habituative transmitter gate</td><TD>d[dt: yki(t)] = H*(K - yki) - L*fk(xk)*yki</td></tr><TR><TD>LTM</td><TD>gated steepest descent learning</td><TD>d[dt: zki(t)] = Mk*fk(xk)*(hi(xi) - zki)</td></tr></table>