Table 1. Summary of experimental sessions.

Sessionnumber	Group size	Condition	Time, Date
1	7	decrement	11∶00, 2011/09/15
2	3	decrement	12∶00, 2011/09/30
3	10	increment	13∶00, 2011/09/15
4	5	increment	11∶00, 2011/09/22
5	2	decrement	11∶00, 2011/09/23
6	6	decrement	11∶00, 2011/09/16
7	9	increment	12∶00, 2011/09/08
8	8	decrement	12∶00, 2011/09/09
9	3	increment	12∶00, 2011/09/14
10	9	decrement	11∶00, 2011/09/09
11	8	decrement	13∶00, 2011/09/08
12	7	increment	12∶00, 2011/09/16
13	2	decrement	10∶00, 2011/09/30
14	3	increment	11∶00, 2011/09/21
15	8	decrement	11∶00, 2011/09/08
16	2	increment	11∶00, 2011/10/07
17	5	increment	11∶00, 2011/12/05
18	6	decrement	09∶00, 2011/12/05
19	8	increment	12∶00, 2011/12/01
20	3	increment	11∶00, 2011/11/30
21	3	decrement	12∶00, 2011/11/17
22	5	decrement	12∶00, 2011/11/10
Discard 1	8	increment	12∶00, 2011/09/15
Discard 2	9	increment	15∶00, 2011/12/07
Discard 3	9	decrement	14∶00, 2011/12/07
Discard 4	7	increment	10∶00, 2011/12/05
Discard 5	5	increment	11∶00, 2011/12/01
Discard 6	4	increment	11∶00, 2011/11/18
Discard 7	3	decrement	11∶00, 2011/11/16