Table 4. Follow-up data for a significant Trial Type × Positive/Negative interaction.

Pigeon	Source	df	t	p
Arbitrary and identity matching
67R	P training vs. N training	2	16.51	p < 0.001
	P testing vs. N testing	2	8.95	p < 0.001
	P training vs. P testing	2	1.28	p < 0.05
	N training vs. N testing	2	−1.86	NS
	Error	188
Arbitrary matching only
27R	P training vs. N training	2	36.27	p < 0.001
	P testing vs. N testing	2	0.90	NS
	P training vs. P testing	2	13.42	p < 0.001
	N training vs. N testing	2	−5.21	p < 0.001
	Error	372
Arbitrary matching only
73W	P training vs. N training	2	10.10	p < 0.001
	P testing vs. N testing	2	0.10	NS
	P training vs. P testing	2	6.39	p < 0.001
	N training vs. N testing	2	1.01	NS
	Error	372
Arbitrary and identity matching
10R	P training vs. N training	2	12.76	p < 0.001
	P testing vs. N testing	2	3.37	p < 0.001
	P training vs. P testing	2	4.77	p < 0.001
	N training vs. N testing	2	−1.75	NS
	Error	188
Arbitrary and identity matching
44R	P training vs. N training	2	7.85	p < 0.001
	P testing vs. N testing	2	0.36	NS
	P training vs. P testing	2	1.62	NS
	N training vs. N testing	2	−4.38	p < 0.001
	Error	188
Arbitrary matching only
10R	P training vs. N training	2	19.86	p < 0.001
	P testing vs. N testing	2	0.04	NS
	P training vs. P testing	2	2.79	p < 0.05
	N training vs. N testing	2	−7.99	p < 0.001
	Error	372
Arbitrary matching only
44R	P training vs. N training	2	15.18	p < 0.001
	P testing vs. N testing	2	0.42	NS
	P training vs. P testing	2	9.25	p < 0.001
	N training vs. N testing	2	1.52	NS
	Error	372

Note. P  =  positive and N  =  negative.