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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: Eur J Neurosci. 2011 Nov 25;35(1):160–165. doi: 10.1111/j.1460-9568.2011.07929.x

Figure 1.

Figure 1

Escapable tailshock (ES) 24 hours prior to inescapable tailshock (IS) blocks potentiation of morphine conditioned place preference (CPP). Data are expressed as mean + SEM difference of time (sec) spent in the morphine-paired environment before and after conditioning. Positive scores indicate a shift in preference for the morphine-paired environment. Both a single session of IS (HC/IS) or two sessions of IS (IS/IS) potentiated morphine CPP as compared to behavioral immunization (ES/IS) and non-stressed controls (HC/HC). *Significantly different from HC/IS and IS/IS (p < 0.05).