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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 1.

Figure 1

Mean (± SEM) change in interbeat interval (IBI) to the conditioned stimulus (CS) from the average pre-stimulus baseline IBI for rabbits in the cholesterol + copper, cholesterol, copper and control groups during CS-alone Habituation trials on Day 1 and during CS-alone test trials on Days 1 and 2 and on Days 3-8 following Post Test 1. Baseline IBIs are derived from the electrocardiogram (ECG) recorded 2,000 ms before CS-onset and IBIs to the CS are derived from the ECG recorded for 2,000 ms after CS onset.