Chapter 1, The Reptilian Spectacle - UWSpace - University of ...

Figure 2-7. Graph of two representative trials. The blue lines indicate when spectacle blood flow
occurred. The periods during which the threats were presented are indicated by the red lines labeled
“Threat 1” and “Threat 2”. A visual appraisal is sufficient to determine that the total duration of blood
flow during the threat presentations is less than when the subject was undisturbed.
Proportion of time during
which blood ow occurs
Presence of
blood flow }
Presence of
blood flow }
.8000
.6000
.4000
.2000
.0000
Threat 1 Threat 2
0 10 20 30 40 50 60 70
0 10 20 30 40 50 60 70
*
1
*
*
Before During After Before During After
Threat Event
*
*
2
Time (min)
46
Figure 2-8. Plot of the proportion of
time during which spectacle blood
flow occurred before, during and
after each threat event. The plots
show the mean (horizontal bar), the
25%-75% intervals and the standard
deviation, as well as outliers. It can be
seen that the proportion of flow during
the threat events is less than the 8
minute blocks before and after each
threat was presented. As well the
25-75% intervals are very similar in the
8 minutes before and after each threat,
indicating a rapid return to baseline
after the threat is removed.