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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Neurotoxicology. 2008 Jul 10;29(6):1127–1130. doi: 10.1016/j.neuro.2008.06.01

Figure 1.

Figure 1

Percentage of freezing behavior observed after the tone/shock on conditioning day in Control and Pb2+-exposed rats in both the Immediate Shock (IS) and Fear Conditioning (FC) behavioral groups. There were no differences in the observed freezing time between Control and Pb2+-exposed groups. There was an obvious increase in the freezing time for the FC group (allowed exploration of the test box and received a CS and US) when compared to the IS group (no exploration of the test box and only US). Data are expressed as mean ± s.e.m.