Table 3.

Percentage of Correct Responses and Binomial z Scores for Chimpanzees on the First and Second Exposures to Each of the 14 Individual-Discrimination Stimulus Sets in the Individual-Discrimination Task in Experiment 2

	First exposure (Trials 1–14)		Second exposure (Trials 15–28)
Subject	% correct	z score	% correct	z score
Jarred	43	−0.53	86	2.67**
Katrina	57	0.53	71	1.60
Kengee	64	1.07	64	1.07
Lamar	57	0.53	50	0.00
Scott	71	1.60	86	2.67**
Group results	59	1.44	71	3.59**

^**p < .01.