Abstract
Activity of single septal units was recorded in rats anesthetized with Dial-urethane. Under ad lib food and water conditions, medial septal units discharged faster and had faster rise times than lateral septal cells. Hydration states were manipulated such that blood volume and osmotic pressure were changed both separately and together. Septal cells often responded both to volemic and to osmotic stimuli. Firing rates were usually faster during and after dehydrating stimuli than hydrating stimuli. Cells in ad lib rats discharged faster than cells in rats anesthetized either immediately before or immediately after the 0.5 hr drink period of a 23.5 hr water deprivation schedule.
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