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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Pharmacol Biochem Behav. 2012 Jan 20;101(3):417–426. doi: 10.1016/j.pbb.2012.01.010

Figure 1.

Figure 1

Amphetamine treatment on ethanol intake and on ethanol preference of dyad- and single-housed rats. Rats were injected with saline or an amphetamine injection (0.3, 0.9 or 2.7 mg/kg IP) 30 min before a 1-hour drinking period during which they had a choice of a 6% ethanol solution and water. Testing was carried out before differential housing, while all rats were individually housed, and again when rats were housed either in dyads or SiH. (A) The ethanol intake ratio reflects the change in intake from the pre-dyad to the dyad test, and was calculated as explained in the Methods section. (B) Ethanol preference was calculated as the percent of the total fluid intake based on the ethanol intake data, and the ethanol preference ratio was calculated as explained in Methods section. Data represent the mean ± SEM for 13 dyad-housed rats and 11 SiH rats. Statistically significant differences from the saline and the 2.7 mg/kg groups are designated as (^) and (*), respectively. Significant group difference from the Dom rats, Sdom and the SiH group are designated by (D), (SD) and (Si), respectively. Significance level was set at P<.0167 as determined by the Bonferroni test.