Table 1.

Procedural differences—USA and NZ projects.

Contrast	USA	NZ
Number of Birds	11	6
RB Task First	6	3
II Task First	5	3
Screen Resolution	1024 × 786	640 × 480
Choice Assignment	Visual	Spatial / Visual
Choice Colors	Blue / Red	Green / Red
Stimuli per Category	200	40
Stimulus Size	3 × 3 cm	9.5 × 12 cm
Task	Simultaneous	Zero-Delay
Warning Signal	Yes	No
Trial-Start Response	Yes	No
Observing Response	Variable 13-15 pecks	Fixed 5 pecks
Sample Illuminated during Response	Yes	No
Inter-Trial Interval	3 s	9 s
Timeout	Dark 8 s	Flashing 10 s
Reinforcement Time	2.5 s	3 s
Grain	Mixed	Wheat
Daily Trials	80	90
Criterial Performance	6 sessions ≥ 85%	4 sessions ≥ 80%