Haas H L
Neurosci Lett. 1981 Feb 23;22(1):75-8. doi: 10.1016/0304-3940(81)90288-3.
The postsynaptic effect of histamine and impromidine, an H2-receptor agonist on CA1 pyramidal and dentate granule cells in the hippocampal slice of the rat is a hyperpolarization. Depolarizations are indirectly mediated. It is suggested that the hyperpolarization is generated by a conductance increase to potassium ions in the dendrites.