Figure 7. Population responses to addition of cobalt and reductions in lsqb;Na⁺]_o.

A, addition of cobalt (2 mM) and reductions in [Na⁺]_o slowed conduction time (t). B, cobalt and decreased [Na⁺] increased the threshold current for orthodromically evoked spikes. Data are normalized to the conduction time and threshold current value measured prior to switching to the test solution. * Significantly different from control measure.