This was phenomenological materialism at its worst. The James-Lange Theory apparently did not believe that a quadriplegic can have emotions, since he definitely experiences no bodily sensations. Sensationalism, another form of fanatic empiricism, stated that all our knowledge derived from sensations or sense data. But to experience means to unify these data, to cohere them somehow. The problem was partly a problem of communication.
Emotions are qualia, qualities as they appear to our consciousness.
But, as opposed to sensa, which are particular, qualia are universal. They are subjective qualities of our conscious experience. It is impossible to ascertain or to analyze the subjective components of phenomena in physical, objective terms, communicable and understandable by all rational individuals, independent of their sensory equipment. Wittgenstein demonstrated that a language cannot contain elements which it would be logically impossible for anyone but its speaker to learn or understand. One can use a language either correctly or incorrectly.