(2) substitution of low Ca2+-high Mg2+ artificial cerebrospinal fluid (aCSF) for normal aCS F abolished the 5-HT-induced inhibitory effect but failed to affect the 5-HT-induced excitatory effect;

• (2) 用低 Ca2+-高Mg2+人工脑脊液替换正常人工脑脊液后, 5-HT引起的兴奋效应仍可出现, 但5-HT引起的抑制效应不再出现;