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Effects of 2, 4, and 6 weeks of lead exposure, restraint stress and their combination on bar test. Columns represent mean ± SEM. Four or six weeks of lead exposure, six weeks of restraint stress, and six weeks of their co-exposure significantly (**P < 0.01, ***P < 0.001) elevated bar score compared to the control group. There are statistical differences between periods of exposures (aP < 0.05, aaP < 0.01). Pb, Lead; MPTP, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine.
