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condition for four blocks, each containing five control
trials and five stimulus trials. An average baseline score
was derived for the high and low tones for each trial block.
Beats per minute change was then determined by subtracting
the baseline value from each half second beats/minute
average for each trial block. Those values were then used
to designate average Dl, A1, and D2 for each subject for the
stimuli and control blocks within each condition. Dl was
designated as the lowest point within the first 3 seconds.
The highest point following Dl was considered Al. D2 was
the lowest point following A1. If the last value in the six
second period was the Al, D2 and A1 were the same.
Skin conductance
A computer program calculated baseline, skin
conductance response (change from baseline), range-corrected
skin conductance response scores (minimum and maximum values
within each experimental condition was used in the
calculations), and half recovery time. Data was divided
into four blocks, each containing five control trials and
five stimulus trials. One average range-corrected SCR was
calculated for each stimuli and control block within each
condition. Additionally, range corrected SCR was also
recoded by changing all values under .02 micro ohms to zero.
An average recoded range corrected SCR was calculated for
each stimulus and control block within each condition.