unconditioned response- in classical conditioning, a natural, unlearned response to an unconditioned stimulus.
unconditioned stimulus- in classical conditioning, a stimulus that unconditionally triggers a response.
The deformed monstrosity to the left is my attempt at drawing the kind of water bottle used by domesticated rodents. I recently got a guinea pig for a pet and I have discovered that the reason for this strange design is to keep the rodent in question from urinating or defecating in its water, something it would be capable of if the water was instead presented in a bowl. If a guinea pig can poop on something, it will as a matter of principle.