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Experimental setup (A, lights on; B, lights off). Rats ran in one direction from a starting wall to an end box. The length of the track was 200 cm on the first and third trials. On the second trial, length was chosen semirandomly between 90 cm and 180 cm, in 5-cm steps. Each trial consisted of 10 laps. The location of the end box was constant, whereas the location of the start wall varied with track length.
