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. Author manuscript; available in PMC: 2008 Jul 19.
Published in final edited form as: Behav Brain Res. 2007 Mar 30;181(1):52–63. doi: 10.1016/j.bbr.2007.03.024

Figure 4.

Figure 4

Mean change in PQ interval from the pres-stimulus baseline PQ interval following unconditioned stimulus (US) presentation for the first twenty trials of Pretest and Post Test 1 at the 1- and 2-mA US intensities collapsed across US duration for rabbits in the cholesterol + copper, cholesterol, copper and control groups. PQ intervals are derived from the PQRST waveforms in the electrocardiogram recorded from 2,000 ms before US-onset to 2,000 ms after US onset.