Izquierdo, L A Stress hormones enhance retrieval of fear conditioning acquired either one day or many months before. [electronic resource] - Behavioural pharmacology May 2002 - 203-13 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 0955-8810 Standard No.: 10.1097/00008877-200205000-00003 doi Subjects--Topical Terms: Adrenocorticotropic Hormone--pharmacologyAnimalsAnxiety--psychologyAvoidance Learning--drug effectsConditioning, Psychological--drug effectsElectroshockEpinephrine--pharmacologyExtinction, Psychological--drug effectsFear--drug effectsHormones--pharmacologyLypressin--pharmacologyMaleMemory--drug effectsMotor Activity--drug effectsRatsRats, WistarStress, Psychological--physiopathologybeta-Endorphin--pharmacology