Der einzige Unterschied zwischen uns und den Ratten war, dass die Ratten besser ernährt waren, und
Only difference between us and the 
rats were the 
rats were better fed and cleaner.
 
 
Die Ratten mussten hungern, um die Auswirkungen der Pawlowschen Konditionierung zu beobachten.
The 
rats were being starved to observe the effects on Pavlovian conditioning.