The Classical Model for Episodic Memory

Before we get to the proposed version of the Classical Model for Variable Binding, we propose one for Episodic Memory which will lead to the variable Binding solution.
The Classical Model works well for Semantic Memory where the Memory is formed over many presentations of category members, but it has problems learning things after only one presentation.
Episodic Memory is learned after one presentation.
What is needed is a mechanism to immediately set up a reverberating circuit, and then enable that circuit to stabilise so that it can later be reactivated.
Semantic memory can support this, but needs some extra neurons that will stick the components together. These neurons are in the Episodic area.
For instance, imagine a man falling down in front of your house.
The basic CAs are activated by the presence of the items, man, falling, and house.
Additionally, episodic areas are activated say in the Hippocampus.
As all 4 areas are activated, the connections between them are strengthened, and reverberation makes this connection very strong.
Clearly, the learning rates (synaptic change) are going to be higher between the Semantic and Episodic areas than within the Semantic areas, but the same Hebbian learning mechanism can support both.
This Episodic idea is inspired by (Shastri 2000 SMRITI) work on verb frame formation.
As this episodic area is relatively small compared to the semantic area, episodes can be forgotten.
This can be done by spontaneous activation, or by having the connections overwritten by later episodes.