<span>The UCS in this case would be the gummy candies. They cause the puckering response in Jade naturally, without her awareness. The conditioned stimulus would be the white candy bag, which makes Jade think that there is lemon candy held inside.</span>
AD means Anno Domini - in the year of lord and it means the last 2015 years ("of our time).
CE means the same and it stands for "Common Era" or "Cristian Era"
BCE is the time before this: it stands for Before Current Era
