Figure 1. Experimental design schematics.
Animals were trained in two alternating contexts. In context [AB], they encountered options A5s or B10s in random alternation; in context [CD], they met C10s or D20s (Training). The animals were then tested by introducing, infrequent simultaneous choice trials between options that belonged to different contexts, namely between A5s and C10s and between B10s and C10s (Testing). Delay to food in each option is denoted, in seconds, by the suffixes; symbols exemplify the type of stimuli presented.