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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: J Exp Psychol Anim Behav Process. 2010 Jul;36(3):321–333. doi: 10.1037/a0017588

Figure 2.

Figure 2

For each pigeon in Experiment 1, frequency distributions of response latencies on the forced trials of the standard key (filled circles) and the comparison key (open circles) are shown for four of the conditions in Phase 1.