of each cell type into type PR, type RFe, type RFi or type NP cells was determined with z-score statistics for each neuron (p < 0.05). Z-scores were calculated as (x + b)/s, where x is the mean firing rate during the 1 s period of peak or trough firing relative to the response, b is the mean firing rate during the baseline period, and s is the standard deviation of the baseline period. Baseline consists of firing during the −10 to −7.5 s preceding the reinforced response for each cell. Signal-to-baseline (S:B) ratios for phasic cell firing were determined by dividing the mean firing rate during the 1 s period of peak or trough firing relative to the response (i.e., the signal) by the mean firing rate during the baseline period.
