Table 2.

Mean (standard deviation) tokens sent, tokens expected to be returned, and confidence in this judgment, for groups with fictional receivers who either consume natural or unnatural foods.

Group
Round	Tokens sent	Expected returns	Confidence
Natural food group
Round 1	5.5 (2.3)	6.1 (4.7)	0.2 (0.7)
Round 2	6.0 (2.2)	6.9 (3.8)	0.4 (0.7)
Round 3	5.4 (3.2)	5.3 (3.4)	1.1 (0.7)
Round 4	6.8 (3.4)	5.8 (3.7)	1.1 (1.0)
Unnatural food group
Round 1	5.2 (2.4)	6.5 (4.7)	0.3 (0.7)
Round 2	6.0 (2.7)	5.9 (4.1)	0.5 (0.5)
Round 3	4.4 (2.8)	4.5 (2.4)	1.1 (0.6)
Round 4	3.3 (3.0)	3.6 (4.5)	1.3 (0.9)