Figure 1.

Behavioral task. Rats were tested on a figure 8-shaped maze to choose between two target locations (white circles) depending on the duration of a given time interval. A time interval began when the animal broke the central photobeam (arrow). The central connecting bridge was lowered at the end of the time interval allowing the animal to proceed to either goal location. The central bridge was elevated again when the animal broke a photobeam (arrow) at either goal location. Scale bar: 10 cm.