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AND ROBERT V. DEVIT02 Department of Physiology and Biophysics, University of Washington Seattle 5, Washington for publication January 20, 1954) School of Medicine, (Received INTRODUCTION THROUGH THE WORK of Magoun and his associates (27, 28, 44, 65) and Bremer and Terzuolo (15, 16), portions of the reticular formation are now believed to be the site of a remarkable convergence and interaction of somatic, visceral, auditory, visual and corticofugal inflows. Morin (47) showed that the fast afferent fibers in skin or muscle nerves project into the midbrain tegmentum. Lorente de No (42) recorded sustained activity in reticular neurons and altered such activity by stimulation of central tracts. The present study arose from the preliminary observation (7) that single-unit activity could be evoked in the pons, tegmentum and medial thalamic regions by peripheral stimulation and revealed a remarkable degree of afferent convergence at these sites. Cooper et al. (22, 23) isolated unit activity in the brainstem of goats and described various patterns of spontaneous and evoked repetitive firing. Visual responses were observed in multi-unit (6, 72) and single-unit (23) records from the superior colliculus and in single brainstem reticular units (26) where the responses were more variable than in the
Journal of Neurophysiology – The American Physiological Society
Published: Nov 1, 1954
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