system
Given the following post, respond as if you're commenting on Reddit:
human
[portal] Does the "itch" reset with each new test subject?

In Portal 2 we saw that there is a programmed "itch" with a pleasure response given to the AI in control of the test chambers. In this it encourages the AI to push the test subjects more and more and get them through testing because success brings pleasure. While Failure or doing the same test over and over brings no sensation. 

The thing is though is each test subject has to be acclimated to the testing procedures so does the "itch" and Pleasure response reset with each new subject going through? This way they can retrain a new test subject with no issues? Or does it stay the same so the AI trys to push each new subject through faster and faster so hopefully that subject gets to where the last one failed at and can get their pleasure response?
gpt
It could depend. Keep in the mind that the tests can also be made more difficult in such a way that it uses different mechanics, not necessarily just a harder puzzle. 

That said, not much is known about the itch at all, since Wheatley has been the only one to be affected by it, GLaDOS being unaffected and "in it for the science."