115


 Direct comparison of the mean HR change during the

 shock and reward conditions was also examined by employing a

 repeated measures analyses of variance (ANOVA) using group

 (LH, LH NCS, RH, RH NCS) as the between subject factor and

 condition (shock minus no-shock and reward minus no-reward)

 as the within subject factor. There was no significant

 difference within the two tasks [F(1,43) = .237, P = .629]

 or between groups [F(3,43) = 1.060, P = .376]. The group by

 task interaction was also not significant [F(3,43) = .400, P

 =.754]. The mean bpm change from baseline for each group

 are as follows: LHD mean=.032, sd=2.02; LH NCS mean=.343,

 sd=.820; RHD mean=-.177, sd=2.012; RH NCS mean=.435,

 sd=1.439). The ANOVA table, Table C-52, is presented in

 Appendix C.

 Heart rate Dl, Al, and D2 values for shock task were

 compared to the values for reward task by subtracting the

 control values from the stimulus values for each subject for

 each trial block. These values were compared using a

 repeated measures analysis of variance for each variable.

 The between subject factor was group (LHD, LH NCS, RHD, RH

 NCS) and the within subject factor was task (shock minus

 shock-control and reward minus reward-control). There were

 no significant differences between the shock and reward

 conditions for any of the three variables. The ANOVA

tables, Table C-53, C-54, C-55, are presented in Appendix C.