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Shock versus reward tasks. Since the results of the
SCR data comparing the shock and reward conditions revealed
significant results, medications were also used as a
covariate in the analysis comparing the shock and reward
trials. A repeated measures analyses of covariance was
employed where group was the between subjects factor and
task (shock minus no-shock and reward minus no-reward) was
the within subject factor. When the percentage of responses
was examined, the main effect for group remained significant
[F(3,43) = 5.25, P < .01] As in the ANOVA, the interaction
by group and task approached significance [F(3,43) = 2.81, P
= .050. The ANCOVA table, Table C-71, is presented in
Appendix C.
A similar analysis was employed using recoded range
corrected SCR as the dependent variable. In this analysis
group was the between subjects factor and block (1 to 4) and
task (shock minus no-shock reward minus no-reward) were the
within subject factors. Again, the main effect for group
remained significant [F(3,42) = 3.82, P <.05.]. The
interaction between group and task also remained significant
[F(3,43) = 4.81, P < .01] Table C-72, in Appendix C,
depicts the results of this analysis. Appendix C.
Summary of medication effects. In sum, these analyses
suggest that the presence of medications that affect the ANS
does not account for the significant main effect of group
for the percentage of SCR responses. As stated above,