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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: Psychopharmacology (Berl). 2011 Nov 15;224(1):69–79. doi: 10.1007/s00213-011-2562-3

Figure 1.

Figure 1

Cocaine choice (top panels), numbers of reinforcers earned as food pellets (center panels) and numbers of injections earned (bottom panels) in monkeys that were affected (left column) or unaffected (right column) by exposure to treats before the self-administration session. The heading of the top graph in each column indicates the number of dominant (D) and subordinate (S) monkeys in each column of graphs. Ordinates: percent of reinforcers earned as injections (top row) and absolute number of food reinforcers earned (center row) or injections earned (bottom row). Abscissae: cocaine dose available as an alternative to one food pellet. Data points are means ± SEM.