TRH on rat conditioned avoidance behavior: interaction with brain catecholamines. 
TRH (10 micrograms) intracerebroventricularly injected improves the acquisition of a two-day avoidance conditioning.  This effect is partially antagonized by pretreatment IP with alpha-methyltyrosine (60 mg/kg) or disulfiram (300 mg/kg).  L-DOPA (100 mg/kg) administered IP 2 hr after alpha-MT partially restores the facilitatory effect of the hormone.  The possible roles of brain catecholamines on the behavioral effect of TRH are analysed.  Other tentative mechanisms of action are also discussed.