What is a behavior you engage in that only occurs in the presence of a specific stimulus (SD), but does not occur in the presence of some other stimulus (SΔ)? How did you come to discriminate between the two stimuli? Did you demonstrate generalization?
I have a number of friends on group text. When I send a text to the group, friends 1, 2, and 4 almost always respond immediately. Friend 3 rarely responds when I text to the group. However, if I send an individual text to friend 3, they usually respond. The SD in this scenario is the individual text thread on my phone, signaling that friend 3 will respond (reinforcement). The SΔ is the group text thread on my phone, signaling friend 3 will not respond (extinction). Friends 1, 2, and 4 have open schedules and ample free time during the day. Friend 3 has a busy schedule and limited free time during the day. I engaged in stimulus generalization in the future by only individually texting friends who also have busy schedules.