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  Indian J Med Microbiol
 

Figure 2: Morphine dose–response curve in the conditioned place preference pattern. The preference of score was calculated as the difference between the time spent in the drug-paired compartment on the 5th and 1st day (a). The changes of locomotor activity parameters on the 5th day were compared between groups. Time spent and locomotor activity parameters (line crossings and the distance traveled on the testing day [b and c, respectively]) were recorded. Data are expressed as mean ± standard error of the mean. *P < 0.05 different from the saline control group (n = 6–9)

Figure 2: Morphine dose–response curve in the conditioned place preference pattern. The preference of score was calculated as the difference between the time spent in the drug-paired compartment on the 5<sup>th</sup> and 1<sup>st</sup> day (a). The changes of locomotor activity parameters on the 5<sup>th</sup> day were compared between groups. Time spent and locomotor activity parameters (line crossings and the distance traveled on the testing day [b and c, respectively]) were recorded. Data are expressed as mean ± standard error of the mean. *<i>P</i> < 0.05 different from the saline control group (<i>n</i> = 6–9)