Three weeks after acute stress, rats were injected with saline or cocaine (15 mg/kg, i.p.), sacrificed 45 min later and the expression of AMPA surface expression were examined. The number of rats in each group (non-stress/saline, non-stress/cocaine, stress/saline, stress/cocaine) were 6. The results were analysed by a two-way ANOVA and a significant main effect of stress vs no stress were measured F(1,16)=9,254, p<0.01. *p<0.05 comparing pre-stress and non-stress groups.