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. Author manuscript; available in PMC: 2008 Jan 25.
Published in final edited form as: Behav Brain Res. 2006 Nov 13;176(2):244–250. doi: 10.1016/j.bbr.2006.10.008

Figure 1.

Figure 1

(a) Average Activity. Cage cross-overs were counted during the 2-min baseline period before the onset of the tone and shock on training day. Subjects receiving 0.1, 1, 5, or 15 mg/kg cocaine, i.p., 15-min prior to training showed hyperactivity compared to saline control subjects. (b) Shock Reactivity. Velocity was measured during the 2s prior to the first shock (Baseline) and during the 2s of the first shock (Shock). Only subjects receiving 15 mg/kg showed an increase in velocity during Baseline, compared to controls. All groups showed a marked increase in velocity from Baseline to Shock. The velocity during Shock did not differ between groups, showing no dose-dependence in Unconditioned Response.