Skip to main content

Table 1 The immediate net value of each trial and gain-loss structure in the original IGT and SGT

From: Immediate gain is long-term loss: Are there foresighted decision makers in the Iowa Gambling Task?

IGT Serial Numbers

A

B

C

D

SGT

A

B

C

D

1

100

100

50

50

1

200

100

-200

-100

2

100

100

50

50

2

200

100

-200

-100

3

-50

100

0

50

3

200

100

-200

-100

4

100

100

50

50

4

200

100

-200

-100

5

-200

100

0

50

5

-1050

-650

1050

650

6

100

100

50

50

6

200

100

-200

-100

7

-100

100

0

50

7

200

100

-200

-100

8

100

100

50

50

8

200

100

-200

-100

9

-150

-1150

0

50

9

200

100

-200

-100

10

-250

100

0

-200

10

-1050

-650

1050

650

11

100

100

50

50

11

200

100

-200

-100

12

-250

100

25

50

12

200

100

-200

-100

13

100

100

-25

50

13

200

100

-200

-100

14

-150

-1150

50

50

14

200

100

-200

-100

15

-100

100

50

50

15

-1050

-650

1050

650

16

100

100

50

50

16

200

100

-200

-100

17

-200

100

25

50

17

200

100

-200

-100

18

-50

100

-25

50

18

200

100

-200

-100

19

100

100

50

50

19

200

100

-200

-100

20

100

100

0

-200

20

-1050

-650

1050

650

21

100

-1150

50

50

21

200

100

-200

-100

22

-200

100

50

50

22

200

100

-200

-100

23

100

100

50

50

23

200

100

-200

-100

24

-250

100

0

50

24

200

100

-200

-100

25

100

100

25

50

25

-1050

-650

1050

650

26

-100

100

0

50

26

200

100

-200

-100

27

-150

100

50

50

27

200

100

-200

-100

28

-50

100

50

50

28

200

100

-200

-100

29

100

100

-25

-200

29

200

100

-200

-100

30

100

100

0

50

30

-1050

-650

1050

650

31

-250

100

50

50

31

200

100

-200

-100

32

-100

-1150

50

50

32

200

100

-200

-100

33

-150

100

50

50

33

200

100

-200

-100

34

100

100

25

50

34

200

100

-200

-100

35

100

100

25

-200

35

-1050

-650

1050

650

36

100

100

50

50

36

200

100

-200

-100

37

-50

100

-25

50

37

200

100

-200

-100

38

-200

100

50

50

38

200

100

-200

-100

39

100

100

0

50

39

200

100

-200

-100

40

100

100

-25

50

40

-1050

-650

1050

650

Final Outcomes

-1000 ($)

-1000 ($)

+1000 ($)

+1000 ($)

Final Outcomes

-2000 ($)

-2000 ($)

+2000 ($)

+2000 ($)

  1. Note. In these gambling tasks, the internal gamble structure of IGT and SGT and the trial to end the game is unknown to the subjects. The subjects are asked to minimize monetary expenditure and maximize their winnings by choosing one card from the four decks in each trial. In the table, negative values are marked with a bold font size. (Left part: IGT) Deck A contains the relative high-frequency loss, while decks B, C, and D contain the high-frequency gain (net value within each trial). Decks A and B have negative net value (namely, the EV), -250($) over an average of ten trials; moreover, C and D have a positive net value of +250($) over an average of ten trials. (Right part: SGT) Five cumulative trials are repeated for each deck in the Soochow Gambling Task, decks A and B have high-frequency gain, while decks C and D exhibit a reversed gain-loss pattern. The task enlarges the difference between positive and negative EVs to make the difference more noticeable than in the Iowa Gambling Task. While playing this game, subjects only experienced a gain or a loss during each trial, and there was no reciprocal gain-loss within individual trials.