Methods: Male Sprague-Dawley rats received bilateral injection of bicuculline methiodide (10, 50, or 100 pmol/0.5 l) or saline (0.5 l) into the BLA.

• 方法：雄性SD大鼠被注射甲碘化荷包牡丹碱（10，50或100pmol/0.；5ml）或生理盐水（0