SIXTY PIVfi DAY RATS tPi,5 4 



87 



*2 



3 



C57 



UNIT = 1 



10 20 30 40 50 60 70 80 



mmM OF' trialjS 



UNIT = 10 



100 200 300 400 500 600 700 3-00 

 TOTAL TIME (SBOONDS) 



S7 



lb 

 OB 



2 



UNIT = 100 



IJJ iiUO ciUU 400 OOO 600 700 800 



DISTANCbI Cgentimetkrs) 



