Skip to main content
. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Biol Psychiatry. 2010 Nov 3;69(3):253–259. doi: 10.1016/j.biopsych.2010.09.003

Figure 1.

Figure 1

Meth SA during short access (1 hour/day) and long access (6 hours/day) sessions. Stable meth intake (average = 1.07 mg/kg/day) was seen during the short access phase (○), but robust escalation of meth intake occurred during the long-access phase (day 1 = 3.05±0.76 mg/kg/day; day 14 = 6.75±0.50 mg/kg/day). Meth intake is shown for the total 6 hour session (■) and for the first hour of the session (●). Significant differences are noted between the first day and subsequent days of long access sessions (*p < .05; **p < .01, ***p < .001).