108
the experimenter brought the dollars or tickets into the
chamber and placed them on the table in front of the
subject. The subjects were instructed that at the end of
the task, they could take their money or tickets from the
table.
Heart rate. Overall heart rate was explored by
calculating average heart rate change from baseline and
employing a repeated measures analyses of variance (ANOVA)
with group as the between subjects factor (LHD, LH NCS, RHD,
RH NCS) and condition (reward, no-reward) as the within
subject factor. Additionally, heart rate Dl, A1, and D2
were examined also using repeated measures ANOVAs. In these
analyses group was the between subject factor and block (1
to 4) and condition (reward and no-reward) were the within
subject factors. One subject from the LH NC group was
excluded for having unusually high and variable heart rate.
Figures C-4, C-5, and C-6, in Appendix C, depict the heart
rate change in beats per minute over half second intervals
for the NCS, RHD, and LHD groups respectively.
Results of the ANOVA for overall heart rate revealed no
significant main effects for groups [F(3,43) = .762, P =
.522] or condition [F(l,43) = .961, P = .332]. The
interaction was also not significant [F(3,43) = .425, P =
.736]. The ANOVA table, Table C-40, is presented in
Appendix C. The mean change from baseline in beats per
minutes for each group is as follows: LHD=-.675, sd=1.82; LH