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Experiments were performed to examine the effects of intracerebroventricularly administered cholecystokinin octapeptide sulfate ester (CCK-8-SE) and unsulfated cholecystokinin octapeptide (CCK-8-NS) on electrical self-stimulation behavior elicited from the medial forebrain bundle. CCK-8-SE and CCK-8-NS in 80 pmol doses reduced the response rate of self-stimulation behavior 22-30 min following injection, while 400 pmol doses of these peptides attenuated self-stimulation behavior between 13 and 36 min. It is suggested that CCK-8-SE and CCK-8-NS interact with central rather than peripheral nervous mechanisms.
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