stylistic:tone, structural:expansion, quality:corruption, information:filtering
History of study

The main fields of distribution of the receptor organs fundamentally distinguishable seem, therefore, to be two, namely, a surface field constituted by the surface layer of the organism, and a deep field constituted by the tissues of the organism beneath the surface sheet. the stimulations occurring in deep field is that the stimuli are traceable to actions of the organism itself, and are so in much greater measure than are the stimulations of the surface field of the organism. Since in the deep field the stimuli to the receptors are delivered by the organism itself, the deep receptors may be termed proprio-ceptors, and the deep field a field of proprio-ception.