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. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: Behav Processes. 2012 Nov 19;93:4–24. doi: 10.1016/j.beproc.2012.11.003

Figure 15.

Figure 15

Transfer with further expansion of the training set to 64 items and then to 128 item. Pigeons now show partial transfer (and partial concept learning) following training on 128-item set relative to their baseline performance, whereas at this same set size monkeys show transfer equivalent to their baseline performance—and therefore full abstract-concept learning.