|Table 4: Intrahippocampal administration of drugs that act on the histaminergic system and memory performance.|
1Effect reverted with concomitant administration of the H2 receptor antagonist ranitidine
2Effect reverted with concomitant administration of the H1 receptor antagonist pyrilamine
3Impairment induced using intrahippocampal injection of MK-801
4Impairment induced using intraseptal injection of muscimol
5Impairment induced using intrahippocampal injection of scopolamine.