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table, Table C-4 is presented in Appendix C. The means and
standard deviations for each group collapsed across tone and
block were: LHD mean=3.881, sd=13.690; LH NCS mean=14.691,
sd=27.809, RHD mean=3.895, sd=14.528; RH NCS mean=13.549,
sd=23.073.
To sum, during the psychophysiological screening
procedure, subjects had a greater heart rate D1 to the novel
tone. There were no differences between the tones in
overall heart rate, percentage of SCR responses, or amount
of skin conductance responding. Additionally, there were no
group differences found for either heart rate or skin
conductance.
Experiment 1
Experiment 1 consisted of two tasks (shock or reward).
During each condition, heart rate, skin conductance,
ipsilateral corrugator EMG, and bilateral zygomatic EMG were
recorded during a three second baseline, tone onset, and a
six second anticipation period. Within each task, the tone
onset signaled either a stimulus or control trial. High
tones always signaled stimulus trials (i.e., shock and
reward) and low tones always signaled control trials. There
were 40 trials within each task which were divided into four
10-trial blocks. Within each block there were 5 stimulus
and 5 control trials. Subjects were administered the Self
Assessment Manikin at the end of each 10-trial block.