Data showed that CTA occurred under both one trial and tWo trials of CS-UCS paring, but conditioned immunosuppression, as assessed by spleen cell proliferation to mitogen and the number of peripheral leukocyte and lymphocyte, required 2 parings.

• 结果表明不管是一次性的还是两次性的CS－UCS结合训练都能使动物明显地建立起味觉厌恶性条件反射，然而条件反射性免疫抑制只在两次性CS－UCS结合训练后才观察到。