Fig. 4.

Each triangle represents one neuron. Top row, open upward pointing triangles: percentage of each neuron's matched pairs that increased from zero FR in time 1 (T1FR = 0) to nonzero value in T2 (T2FR ≠ 0) Bottom row, solid downward pointing triangles: percentage of each neuron's matched pairs that decreased from a nonzero T1FR value to a zero T2FR value (y-axis inverted to visually suggest the decrease to zero FR). In each row, each neuron's percentage is regressed onto its average T1FR (log10-transformed) at each dose of cocaine. Solid line, regression line for each scatter plot. For ease of readability, overlapping triangles with an average T1FR of 0 were jittered.