Psychoanalysis and The Unconscious by D.H. Lawrence

Consciousness develops on successive planes. On each plane there is the dual polarity, positive and negative, of the sympathetic and voluntary nerve centers. The first plane is established between the poles of the sympathetic solar plexus and the voluntary lumbar ganglion. This is the active first plane of the subjective unconscious, from which the whole of consciousness arises.

Immediately succeeding the first plane of subjective dynamic consciousness arises the corresponding first plane of objective consciousness, the objective unconscious, polarized in the cardiac plexus and the thoracic ganglion, in the breast. There is a perfect correspondence in difference between the first abdominal and the first thoracic planes. These two planes polarize each other in a fourfold polarity, which makes the first great field of individual, self-dependent consciousness.