Table 1.

Average parameters and results in the four series of experiments

Series1 (n = 20)2 (n = 14)3 (n = 16)4 (n = 19)Total (n = 69)Exp versus Con Wilcoxon TSeries K–W H
Shock (mA)
    Exp5.56.24.85.55.5723.0NS1.69NS
    Con5.55.05.05.25.0
Criterion (mm)
    Exp0.620.620.620.620.622.0NS1.29NS
    Con0.620.620.620.620.62
First response (s)
    Exp282840413310.61*
Time above criterion (%)
    Pre
        Exp154231145.5NS2.56NS
        Con25322
    Phase I training
        Exp9292959494276.5**2.38NS
        Con6670806970
    Phase I extinction
        Exp3129252329847.5*3.47NS
        Con1722261418
    Phase II training
        Exp9294949694795.5*3.02NS
        Con7584949588
    Phase II extinction
        Exp2219143119692.0**1.65NS
        Con1112131312
Spontaneous contractions (s)
    Pre
        Exp3410810129651081.5NS6.53NS
        Con6099783963
    First extinction
        Exp12716810677106875.0*7.69NS
        Con84781076979
    Last extinction
        Exp651046070691015.5NS4.99NS
        Con6282577271
Baseline shift (mm)
    Pre
        Exp00000812.0NS4.07NS
        Con00000
    First extinction
        Exp1.410.780.780.940.62842.5NS1.96NS
        Con0.940.311.090.620.62
    Last extinction
        Exp1.720.310.621.560.94604.5*1.06NS
        Con0.47−0.160.160.620.31
  • Median values of the parameters and results in the four series of experiments (see Materials and Methods) and overall are shown. The experimental and control animals were compared by Wilcoxon’s signed-ranks tests (T), and the four series of experiments were compared by Kruskal–Wallis ANOVAs (K–W H). Exp, Experimental; Con, control; Pre, pretest period.

  • *p < 0.05;

  • **p < 0.01;

  • NS, not significant.