Two reason Andrew Carnegie was a "big deal" in business, was first in the way he took full advantage of vertical integration. Buying everything he needed, including railways, to run his business. He is best remembered for this method, another factor that contributed to his "big deal" is his strong-rooted belief in philanthropy. He donated roughly 90% of his wealth to charity. Going so far as to write "The Gospel of Wealth."
Honestly, I believe that the most reliable resource would be to visit a local animal hospital.
Since it is an experimental veterinary procedure, you won't find much information in books or online. And contacting the local society for veterinarians may not yield results.
I believe the answer is: Changes in speed
Average people tend to become more focus and accelerate our effort when we're on the brink of finishing a certain goal.
So in the scenario above, when a sudden tense/increased movement happen in our body the researchers could perceive it as we're on the brink of finishing an action.
