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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: Behav Neurosci. 2011 Apr;125(2):194–201. doi: 10.1037/a0022919

Table 1.

Mean (SEM) percentage of choice of large milk volume across training sessions.

Session
Age/Strain 1 2 3 4 5 6 7
Adolescent
D2 49.4 (3.8) 51.0 (4.3) 54.6 (3.0) 63.5 (2.8) 61.6 (4.3) 59.4 (5.5) 64.8 (4.1)
B6 53.2 (2.5) 55.0 (3.6) 59.6 (2.4) 63.4 (2.8) 70.6 (2.6) 63.4 (3.0) 65.0 (2.8)
Adult
D2 56.3 (5.0) 58.0 (8.2) 67.3 (6.5) 70.4 (6.7) 65.7 (7.3) 71.5 (4.8) 69.8 (6.0)
B6 63.7 (3.4) 69.1 (2.7) 78.0 (1.7) 76.1 (2.3) 76.5 (3.3) 74.6 (3.3) 72.6 (3.6)