Boris Sidis,
The Foundations of Normal and Abnormal Psychology…
(1914
| notes)
“ Quite often, however, the dissociation is so deep and extensive that the synthetized system of secondary sensory elements does not bear the least trace of the qualitative aspect of the primary sensory elements; thus a morbid condition of the pharynx, for example, may give rise to an auditory and even to a visual hallucination. Whatever may be the qualitative character of the sensory compounds one thing stands out clear and distinct, and that is the fact that the percept, whether normal or abnormal, does not consist of images, but of sensations, primary and secondary. ”
