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From the results of his own experimental observations and from evidence accumulated during recent years in the anatomical and physiological literature the author assumes the existence of two distinct systems of central sensory paths—the system of "primary" or "specific" paths (to the specific nuclei of the thalamus) and the system of "associative" or diffuse and "non-specific" paths. He presents evidence that the center median is the main thalamic end station shared via suprageniculate reticular formation by all afferent "associative" paths whatever the afferent modality. In an extensive series of experiments on cats with implanted electrodes intact and moving free, immobilized by Flaxedil, anesthetized by Chloralose, and prepared by decortication, by section at C-1-C-2 (encepale isolé), by midpontine pretrigeminal transection, and by intercollicular decerebration (cerveau isolé) Meulders studied the potentials evoked by photic stimulations of the retina in the optic tract, in the lateral geniculate and in the perigeniculate neuroreticulum, in
YAKOVLEV PI. Comparative Study of the Physiology of the Primary and of the Associative Sensory Paths.. Arch Neurol. 1963;9(6):677–678. doi:10.1001/archneur.1963.00460120127016