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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: Drug Alcohol Depend. 2011 Sep 16;121(1-2):140–147. doi: 10.1016/j.drugalcdep.2011.08.022

Figure 4.

Figure 4

(a) Mean (±SEM) whole-session response rates during fan alone (striped bar), fan-plus-Y (white bar), and fan-plus-X (black bar) on Stimulus Compounding Test 2. Asterisk indicates p < 0.05. (b) Mean (±SEM) cumulative responses in fan (diamonds), fan-plus-Y (circles), and fan-plus-X (squares) over the 6 blocks of the test.