4.5.2 SZENTAGOTHAI'S RI CIRCUIT
Figure 4.5-6 illustrates a variation on the basic RI architecture. Note that the reciprocal inhibition acts around an inhibitory interneuron pair and they gate the output neurons. The output neurons do not have feedback around them in this case.
If a common constant frequency drive is applied to N3 and N4, they behave precisely like the RI pair described above in Section 4.5.1. No patterned bursts are generated, and if a slight asymmetry is introduced into the N3, N4 RI system, one neuron dominates and holds the other off. On the other hand, the circuit will sharpen patterned inputs delivered as two-phase spike trains. Two IPFM, VFC "neurons" Na and Nb, are used to convert the nonnegative analog inputs: Ea = A * [1 + cos(rao t)]
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