इवान पावलोव के शास्त्रीय अनुबंधन (क्लासिकल कंडीशनिंग) प्रयोगों में, अनुबंधन होने के बाद घंटी की आवाज को क्या कहा जाता है?

After conditioning has taken place, the salivation exhibited by a dog in response to a stimulus such as a bell, in the absence of food, is referred to as:

In the context of classical conditioning, what role does a bell play when it is paired with food to make a dog salivate?