(a) Example VTE laps: spatial tracking of a rat through the choice point during a non-VTE (left) and VTE (right) lap. (b) Schematic reminder of alternation vs adjustment laps. (c) Example Session: Adjustment Laps are marked with open circles and VTE is marked in red. Laps in the last 50% of the session were identified as “late” laps. (d,f) Proportion of adjustment laps showing VTE: No difference was detected between either group and no effect of opto was detected at the session level. However, when restricting the analysis to adjustment laps occurring only in the later half of the session (e,g), the proportion of VTE for the post-opto active group was found to be significantly less than the baseline and control group sessions. Interestingly, this reduction in VTE appeared to be driven primarily by the opto sessions.