Influence of SOA on choice activity. A, B, Population activity of T1-selective cells aligned on T1 (left panel) and T2 (right panel) and of T2-selective cells aligned on T2. In each panel, mean firing rate and behavioral markers are shown separately for selecting the first target (solid lines) or the second target (dotted lines) and for trials with short (red), medium (blue), or long (black) SOAs. C, Differential activity Δf = f_T1 − f_T2 between the T1 and T2 cell population for selections of T1 (solid lines) and T2 (dotted lines) and the three SOA groups (different colors). Curves start at 0 because baseline activity was subtracted. Markers at the bottom indicate behavioral times for T1 choices (on solid line) and T2 choices (on dotted line) and the three SOA groups (different colors). Marker labels as in Figure 3. Vertical lines indicate alignment.