The work-for-food and work-for-money tasks were programmed
using E-Prime 2.0 (Psychology Software Tools, Inc. Sharpsburg, PA,
USA), and run on networked PCs with 17-in colour monitors and
standard QWERTY keyboards. Instructions were presented in black
font on a white background. For the work-for-food task these were
as follows. First screen: ‘Pizza bar pressing task, please wait for in-
structions.’ Second screen: ‘Starting in 30 seconds you will have one
minute in which you can earn FOOD (pizza) by pressing the SPACE-
BAR. The more times you press the more FOOD (pizza) you will earn.
The maximum amount you can earn is a whole pizza (8 slices). To
maximise what you can earn start bar pressing as soon as you see
the red count-down clock appear below. Have your finger ready at
the SPACEBAR.’ Third screen: ‘KEEP PRESSING THE SPACEBAR. The
more times you press the more FOOD (pizza) you will earn.’ A digital
clock displayed the number of seconds remaining. Final screen:
‘Thank you for completing the task. Please wait for further instruc-
tions from the Experimenter.’ Each sentence of these instructions
appeared centred on a separate line(s) on the screen. The total
number of space bar pressesmade in the designated 1-minute period
was recorded. The work-for-money task was the same as the work-
for-food task except that the first screen was headed ‘Money bar
pressing task’, and MONEY (£££££) replaced FOOD (pizza) on the
second and third screens. In addition, on the second screen it was
stated that ‘The maximum amount that you can earn is £5.’
 
The work-for-food and work-for-money tasks were programmedusing E-Prime 2.0 (Psychology Software Tools, Inc. Sharpsburg, PA,USA), and run on networked PCs with 17-in colour monitors andstandard QWERTY keyboards. Instructions were presented in blackfont on a white background. For the work-for-food task these wereas follows. First screen: ‘Pizza bar pressing task, please wait for in-structions.’ Second screen: ‘Starting in 30 seconds you will have oneminute in which you can earn FOOD (pizza) by pressing the SPACE-BAR. The more times you press the more FOOD (pizza) you will earn.The maximum amount you can earn is a whole pizza (8 slices). Tomaximise what you can earn start bar pressing as soon as you seethe red count-down clock appear below. Have your finger ready atthe SPACEBAR.’ Third screen: ‘KEEP PRESSING THE SPACEBAR. Themore times you press the more FOOD (pizza) you will earn.’ A digitalclock displayed the number of seconds remaining. Final screen:‘Thank you for completing the task. Please wait for further instruc-tions from the Experimenter.’ Each sentence of these instructionsappeared centred on a separate line(s) on the screen. The totalnumber of space bar pressesmade in the designated 1-minute periodwas recorded. The work-for-money task was the same as the work-for-food task except that the first screen was headed ‘Money barpressing task’, and MONEY (£££££) replaced FOOD (pizza) on theหน้าจอที่สอง และสาม นอกจากนี้ บนหน้าจอที่สอง ก็ระบุว่า 'ยอดเงินสูงสุดที่คุณสามารถมีรายได้ได้ £5'
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