Learning and recall of temporal sequences in the network of CA3 pyramidal cells and a basket cell

A new recurrent network model of pyramidal cells and a basket cell in Field CA3 of the hippocampus is proposed. We assume that temporal sequences are processed in the CA3 network, and bursts are used as elements of the temporal sequences in synchronization with the theta rhythm. Besides ordinary synaptic connections between the pyramidal cells, delayed connections are assumed to connect the consecutive elements of temporal sequences. In learning mode, LTP of these connections are caused by burst inputs of theta rhythm. In recalling mode, the cooperative of a cue input, excitatory feedback, inhibitory feedback via the basket cell, and delayed excitatory feedback leads to the successful recall of the learned temporal sequence. The memory capacity of the network strongly depends on the number of firing sites in the spatial patterns.