TABLE 2

Block Layout for Each Observer That Participated in the Study

Session	Initial training images	Blocks	Images/block	Total images*
1	126	6	36 training + 72 testing	774
2	0	8	36 training + 72 testing	864
3	0	8	36 training + 72 testing	864
4	0	6	36 training + 72 testing	648
Total	126	28^†		3,150

↵* Total images = initial training images + (blocks × images/block).
↵† The 28 blocks, comprising 4 blocks per method, were presented to each observer in a random manner.