I understand the word nuance means a very slight/subtle difference specifically applies to meanings, sounds, colours, feelings, and expressions. But what about movements, is there a word that denotes a very slight difference in somebody's movements that is not very obvious?
For example, if I'm in a room next to another room and the rooms are so silent that I could hear virtually every movement/action that the person on the other room makes, not only do I hear him walking, moving objects, him eating/drinking, writing/typing, etc., I could also hear the not so obvious/noticeable movements such as maybe him scratching his arm/leg, rubbing his eyes, to him squirming in his chair, just every subtle movements imaginable.
An example sentence maybe, he has extraordinary trained sense organs that could detect a person's every [?] of movement. Or I could hear every [?] of movement he makes in the other room. Is there a word that could replace nuance in this case to describe movements instead?