End

Figure 4.5-3 illustrates the system response with no recurrent feedback (Do3 = Do4 = 0). With feedback, and with symmetrical parameters as listed in the program above, all four neurons fire more slowly, but in phase. This is shown in Figure 4.5-4. If one makes the circuit asymmetrical by letting Do4 = 1.2 (instead of 1), it is clear from Figure 4.5-5 that N2 dominates the output. From extensive investigation of this model by varying the input frequency and all its synaptic and RPFM parameters, it is clear that this basic RI model is incapable of generating a chopped, two-phase output. However, if symmetrical delays are inserted in the outputs of the two inhibitory interneurons (see Problem 4.10), the basic RI system will generate in-phase bursts on N1 and N2.

The next section examines another RI neural model, attributed to Szentagothai by Bullock and Horridge (1965).

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