Model 1b, Bursting properties
The dependence of granular cell spike number on input delay was nearly unchanged between models #1a and #1b, although the range of maximum spike number sensitivity shifted to larger delay values (figures 6, 14a, 14b). This effect was likely due to the broadened peak of the AMPA mediated EPSPs with respect to the dual electrical synapse components responsible for temporal acuity in the earlier model. Comparison of latencies to burst onset and offset between these two models confirms that this change is due to a shift in the relationship between input delay and latency to first spike, wherein model #1b exhibits shorter latencies than model #1a for delays between 2 and 4ms (figures 11, 14a, 14b). Latencies to burst offset are nearly identical for both models, as would be expected due to the unchanged, burst-ending LMI delivered IPSP at 57ms post-EOCD input.
