Table 1.

Percentages (raw proportions) of ″Trust″ and ″Repay″ choices in trust games with different temptation values T and different Repay payoffs R

Group (N)Investor: percent who chose TrustTrustee: percent who chose Repay
T = 45T = 60T = 60R = (30,30)T = 100AvgT = 45T = 60T = 60R = (30,30)T = 100Avg
VMPFC (6)50 (3/6)50 (3/6)50 (3/6)33 (2/6)46 (11/24)33 (2/6)33 (2/6)17 (1/6)0 (0/6)21 (5/24)
BDC (17)59 (10/17)65 (11/17)53 (9/17)71 (12/17)620.23 (42/68)47 (8/17)59 (10/17)35 (6/17)24 (4/17)410.11 (28/68)
NC (16)56 (9/16)63 (10/16)50 (8/16)50 (8/16)550.32 (35/64)75 (12/16)63 (10/16)56 (9/16)44 (7/16)590.02 (38/64)
  • The Avg column simply adds up the Trust and Repay choices across the four games, giving the aggregate percentage (number) of Trust and Repay choices for each group. Superscripts are one-tailed t test p values between the VMPFC and the row groups, treating each individual as a single data point. Epps–Singleton tests also yielded significant differences (p < 0.05) between the VMPFC group and both comparison groups on the Avg Repay measure (see supplemental Results, available at www.jneurosci.org as supplemental material).