Table 1.

Experimental conditions and available depths cues.

Experiment	Condition	Vergence	Perspective	Angular size
1	Full – F	✓	✓	✓
1	Perspective only – PO		✓	✓
1	Vergence only – VO	✓		✓
2	Non-expansion – NE	✓		✓
2	Expansion – E	✓✺		✓✺

In experiment 1 PO condition, the vergence distance was constant and corresponded to the distance between the observer and the screen. ✺In experiment 2 E condition, the vergence and angular size are in conflict.