Proprioception and Holism

Spinoza does not explicitly refer to Proprioception, but he alludes to its effects in the course of his Lemmas on the Body--while in motion, if parts of the Body maintain their "mutual communication", then the "individual will retain its own nature" "as a whole". The passages are notable in several respects.  First, in even routine Motility, the parts of the Body are unified.  Second, the Unity consists in a "whole", and, hence, not in a mere aggregate of associations.  Finally, by implication, a failure of Unity is equivalent to a loss the individual's "own nature". Such a breakdown thus constitutes a disruption of the Essence of the individual, i. e. a failure of its endeavor to persist in its own being.  In other words, the breakdown is equivalent to Death.  But this cause of Death has internal sources, contrary to his thesis that Death can come only from without.  So, in these passages, he is plainly affirming a Holism that seems to remain underdeveloped through the remainder of the Ethics. And perhaps Proprioception is the ground of that Holism.