. Author manuscript; available in PMC: 2011 Oct 1.

Published in final edited form as: Behav Processes. 2010 Jun 30;85(3):236–245. doi: 10.1016/j.beproc.2010.06.014

Table 3.

Mean percentage and standard deviation of non-complementary confusion errors for all 4 nonreinforced categories for 8 birds in Experiment 1 (chance level at 33%). Note that non-complementary S−s do not come from the same category as the S+s.

Reinforced category	Nonreinforced Category
	Car		Chair		Flower		Person
	M	SD	M	SD	M	SD	M	SD
Car	--	--	26.0^!	4.4	33.3	7.1	40.7	10.9
Chair	21.0^!	4.4	--	--	45.6^*	11.0	33.4	8.8
Flower	21.6^!	3.8	43.0^*	7.7	--	--	35.4	9.8
Person	29.1	7.7	34.3	4.7	36.6	5.7	--	--

Significantly above chance, two-tailed t-test, n = 8, p < 0.05

Significantly below chance, two-tailed t-test, n = 8, p < 0.05