When he was in college, Gabriel spent lots of time learning…

When he was in college, Gabriel spent lots of time learning new skills and keeping up with current events. Now that he is in his 40’s, he spends more time doing things he enjoys such as reading books. His change in behavior would be best explained by (the) __________.

Dorian naturally feels excited when a friend says hello to h…

Dorian naturally feels excited when a friend says hello to him. Since getting a Facebook account, Dorian feels excited when he reads messages on Facebook. After a while, he feels excited when he receives an email telling him that he has a message on Facebook. Dorian has developed a conditioned response to the email notifications because they are associated with Facebook messages, the original conditioned stimulus. This is an example of ____________.