Walter Mischel · 1972
Marshmallow Test
One marshmallow now, or two later? A simple test for 4-year-olds that predicted their future success.
Methodology
Setup:
• 4-year-olds alone in room
• Treat on table
• "If you wait 15 mins, you get two"
Secretly filmed
Findings
⏱️ Wait Time:
• 1/3 ate immediately
• 1/3 waited 15 mins
• Avg: 6 mins
Prediction (Original):
• High delayers had higher SAT scores, better BMI, lower drug use
️ 2018 Re-study:
• Found correlation much weaker
• Economic background was key factor (Trust issues)
Significance
Self-Control:
• Willpower is important but context/trust matters
• "Environment shapes willpower"