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. Author manuscript; available in PMC: 2010 Mar 11.
Published in final edited form as: Comp Cogn Behav Rev. 2007 Jan 1;2:79–92. doi: 10.3819/ccbr.2008.20005

Figure 7.

Figure 7

An example of matching-to-sample displays used with pigeons. Pigeons were required to first make observing responses (pecks) to the sample (upper) cartoon before they were presented simultaneously the sample and two comparison cartoons (left panel). Some pigeons were not required to make this initial observing response requirement (right panel). In either procedure, a peck to the comparison cartoon that matches the sample cartoon was correct. After a choice response, correct choices were rewarded, and an intertrial interval separated trials. Thus, except for the initial observing response, the sequence of events was identical across procedures.