Table 1.

Statistical results. (Two-tailed tests, α=0.05.)

		subject
analysis	statistic	Lana	Mercury	Panzee	Sherman
rewards obtained as a function of toy availability	Z	2.346	2.226	2.451	1.277
	N	10	10	10	10
	p	0.019	0.026	0.014	0.201
toy manipulation as a function of reward accessibility	Z	0.464	2.191	2.701	2.803
	N	10	10	10	10
	p	0.444	0.028	0.007	0.005
rewards obtained in relation to toy manipulation	r	(0.345)
	d.f.	(38)
	p	(0.029)