Figure 6.

Normalization of firing rates in SNr neurons. A, Each row includes raw firing rates and normalized firing rates from two neurons, and corresponding position change from a different mouse. Left column, Raw firing rates of two neurons of a given type from a mouse. Middle column, Normalized firing rates of the same neurons. The rates are normalized by dividing by the baseline rate of each neuron. Right column, Position change. The relative change in position from baseline is shown, as absolute position values are defined by the edge of the camera frame. B, The range of baseline firing rates in neurons from the four different classes. Each graph represents the range of baseline firing rates from a single session. Data from all mice with multiple neurons from a class are shown. There is considerable variability in baseline firing rates, although the correlation with position coordinates is highly similar. C, Distribution of firing rate modulation (% of baseline) per millimeter. Most neurons show comparable degree of modulation relative to movement amplitude.