Reticular Stimulation and the Light-adapted Discharges of the Visually Evoked Cortical Response in Cat

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  • SUZUKI TAKASHI A.
    Department of Surgery (Opthalmology) Cornell University Medical College Dept. of Physiology, Iwate Medical University
  • JACOBSON JERRY H.
    Department of Surgery (Opthalmology) Cornell University Medical College

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When the eye was exposed to a steady background light, the visually evoked cortical response to a test flash consisted of the primary complex and a series of distinct spike-like discharges. The discharges, which are observed within a circumscribed part of area 18, are designated by the authors as the light adapted discharges (LAD). Effects of the reticular stimulation upon the cortical response especially on the LAD are studied. The primary complexes are inhibited by the RF-stimulation, while the LAD are greatly facilitated. The effect is usually observed in association with the arousal pattern of EEG. RF-stimulation effect on the LAD increases gradually with increase in intensity of RF-stimuli (5-20 volts) and with decrease in RF train off-flash on interval. However, RF-effect on the subcortical (OT and LGN) responses are never observed. The conditioning train stimuli given to the LGN have complicated the effect on the LAD, i.e., facilitate at lower intensity of the conditioning stimuli (1-10v.), while they depress at higher (12-50v.). On the other hand, they have only a depressive effect on the primary complex. The effects of RF-stimulation upon the electrically evoked cortical response to OT single shock are observed. The intracortical genetic component are selectively increased by either RF-stimuli or stready light adaptation.

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