500
After breaking up with his fire-breathing heartthrob, Tirrel also experienced ___________ and _____________. He recalls that "the smell of onion breath (CS), no longer paired with the kissing (US), lost its ability to shiver my timbers. Occasionally, though, after not sensing the aroma for a long while, smelling onion breath awakes a small version of the emotional response I once felt."
What is extinction and spontaneous recovery.