Extinction

Muffin was not very excited about extinction, especially since she worked so hard to get to FR 7.  She started by pressing the bar and looking in the food magazine for her reward and when she did not find one she returned to the bar and pressed faster and harder, yet still no sugar pellets. As you can see in the video above Muffin then became frustrated and began to bite the bar and twist, trying anything to get the sugar pellet. She showed examples of extinction bursts when she pressed the bar harder and faster and would bite it and she showed spontaneous recovery when she entered the operant box the second time and started pressing the bar again. 

You can see the extinction bursts on Day 1 where she went from pressing the bar 0 times to 33 times
You can also see Muffin's extinction burst on Day 2 when she went from 10 bar presses to 29