Table 1.

Experiment 1 response rates and food rates

	Baseline	EXT	Test	EXT 2	Test 2
Target	66.43 (28.28)	1.95 (1.92)	8.17 (7.17)	0.13 (0.18)	2.66 (3.47)
Alternative	–	81.32 (37.50)	19.20 (9.73)	75.56 (31.22)	12.45 (4.68)
Inactive	0.04 (0.07)	0.003 (0.01)	0.49 (1.38)	0.001 (0.002)	0.35 (0.62)
Foods	0.97 (0.02)	1.91 (0.05)	–	1.93 (0.03)	–

Displayed are the means and SDs (in parentheses) for the target key response rate, alternative key response rate, and inactive response rates (in pecks/min), as well as the obtained food delivery rate (in foods/min), for each phase of Experiment 1. For baseline, each pigeon’s individual mean for the last five days was first calculated and then included in the analysis above. For each extinction phase, each pigeon’s individual mean was calculated for the entire phase and then included in the calculation above. In each cell of the table above, n = 12