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.
I'm not sure I follow what you are asking here.
Ren(concern for others) and Li(appropriate behavior)
Answer:
This statement is............
True
.......I'm pretty sure
