Figure 3.

Population activity of identified dopaminergic substantia nigra neurons during robust cortical slow-wave activity. A, Mean spontaneous firing rate of calbindin-negative (CB-ve) dopaminergic neurons was significantly faster than that of calbindin-positive (CB+ve) dopaminergic neurons (*p < 0.05, Mann–Whitney U test). Regularity of firing pattern, as defined by CV, did not differ between the two neuron groups. B, Mean activity histograms for all CB-ve and CB+ve dopaminergic neurons during the cortical slow oscillation. Action potentials of both CB-ve and CB+ve neurons were evenly distributed across the active and inactive components of the oscillation. Data in A and B are means ± SEMs.