Okay
Unconditioned stimulus Fridge Door = Unconditioned response = pleasure
Conditioned and unconditioned stimulus fridge door and kong = unconditioned response = pleasure
conditioned and unconditioned stimulus fridge door + kong + crate = unconditioned response = pleasure
conditioned and unconditioned stimulus down = conditioned response = pleasure
So conditioned stimulus = fridge door/kong/crate/down = pleasure
No doubt I have made it too complicated.
He knows the sequence equates to pleasure so he goes through the sequence.... Fridge door, sees kong, goes to crate, lies down = pleasure.
