无条件刺激物：引起有机体无条件反射的无条外界动因，叫做无条件刺激物。刺激物也叫非条件刺激物。什意思无条件刺激物与它所引起的无条无条件反射活动之间有固定的因果关系，只要有机体处在能接受刺激物而进行反射活动的刺激物情况下，这种刺激物的什意思出现必然引起相应的无条件反射。例如，无条狗吃食物时就必然会分泌唾液，刺激物食物就是什意思引起唾液分泌的无条件刺激物。
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