Feelings in their immediacy are "expressed" for if they were not, if they were not also sensible and bodily facts ("psycho-physical phenomena," as the positivists used to call them) they would not be concrete things, and so they would be nothing at all.
Following on the heels of these bodily changes is a sensible "emotion" of the soul as it feels itself moved by the unexpected flow of spirits.
Arnauld rules out the second of his three alternatives on the grounds that the soul cannot form sensible perceptions in itself on the occasion of particular motions in the bodily sensory apparatus because the soul is not aware of those motions.
In particular, it was assumed that observable phenomena and the terms in which we reported them were conditioned, not by universal forms of sensible intuition, but rather by the sorts of external physical factors that affected bodily and specifically physiological processes more generally.
If they exist are they bodily or not, and, if they are not, are they separated from sensible things or do they exist in them?
Bikinis and bodily functions.
