Table 1.

Procedures and Their Sequence for Experiment 1.

Condition order	Pigeon
	410 & 481	364 & 440	365 & 356	372 & 373	371 & 384	370 & 378
1	VR 10	VR 100	VI+ 10	VI+ 200	VI′ 50	VI′ 10
2	VR 400	VR 50	VI+ 50	VI+ 400	VI′ 100	VI′ 400
3	VR 50	VR 10	VI+ 200	VI+ 10	VI′ 400	VI′ 200
4	VR 100	VR 400	VI+ 100	VI+ 100	VI′ 200	VI′ 50
5	VR 200	VR 200	VI+ 400	VI+ 50	VI′ 10	VI′ 100
6	VI+ 50	VI′ 50	VR 10	VI′ 200	VR 200	VI+ 50
7	VI+ 400	VI′ 400	VR 200	VI′ 400	VR 100	VI+ 400
8	VI+ 10	VI′ 10	VR 400	VI′ 10	VR 50	VI+ 100
9	VI+ 100	VI′ 200	VR 50	VI′ 100	VR 400	VI+ 10
10	VI + 200	VI′ 100	VR 100	VI′ 50	VR 10	VI+ 200
11	VI′ 100	VI+ 100	VI′ 400	VR 10	VI+ 200	VR 100
12	VI′ 50	VI+ 10	VI′ 100	VR 100	VI+ 10	VR 10
13	VI′ 10	VI+ 50	VI′ 50	VR 200	VI+ 400	VR 200
14	VI′ 200	VI+ 200	VI′ 10	VR 400	VI+ 50	VR 400
15	VI′ 400	VI + 400	VI′ 200	VR 50	VI+ 100	VR 50