FIG. 12.

The effects of varying synaptic plasticity (τ_plast-Rise and τ_plast-Decay), electrical coupling (g_coup), and delay (delay) parameters on the intersegmental phase difference and on the side-to-side phase difference of motor neurons in the ensemble model. A and B: the intersegmental phase difference between the ipsilateral HE(7) and HE(13) model motor neurons in the peristaltic (A) and synchronous (B) coordination modes is mildly affected by each of the varied parameters and does not approach the magnitude observed in the living system (indicated on graph) for any parameter value. C and D: the side-to-side phase difference between the HE(7) (C) and between the HE(13) (D) model motor neurons is affected by varying the electrical coupling (g_coup), but varying the other parameters (τ_plast-Rise, τ_plast-Decay, and delay) had little effect. Parameters were varied from 0 to 200% of the standard value. Coordination mode-specific intersegmental phase differences and side-to-side phase differences were determined as described in methods.