experiment,estimated_studies_1990_2025,avg_sample_size,main_countries,typical_age_range,education_level,key_finding,effect_size,metric,year_introduced,reference
Ultimatum Game,1000+,100,"USA, Germany, UK, Japan, China, Israel",18-40,University (predominantly),Responders reject unfair offers 20-50% of the time (vs rational prediction of 0%); strong cross-cultural fairness norms,0.75,Cohen d (range 0.5-1.0),1982,"Güth et al. (1982); Camerer (2003)"
Ultimatum Game,1000+,120,"USA, Germany, UK, Japan, China",20-35,University,Proposers offer on average 40-45% of the stake; offers below 20-30% rejected ~50% of the time,0.7,Cohen d,1982,"Camerer (2003)"
Ultimatum Game,1000+,80,"Cross-cultural: USA, Japan, Kenya, Papua New Guinea",18-45,Mixed,Cross-cultural variation: rejection rates vary from ~15% (some developing regions) to ~60% (USA/Europe),0.6,Cohen d,1982,"Henrich et al. (2001)"
Iowa Gambling Task,500+,75,"North America, Europe, Asia",25-40,Mixed (university common),Healthy participants learn to prefer advantageous decks (C & D) over time; net score improves across 5 blocks,0.3,Pearson r (range 0.2-0.4),1994,"Bechara et al. (1994)"
Iowa Gambling Task,500+,60,"USA, Netherlands, Germany",20-45,Mixed,Patients with vmPFC lesions show persistent disadvantageous choices; IGT differentiates clinical from healthy samples,0.35,Pearson r,1994,"Bechara et al. (1994)"
Iowa Gambling Task,500+,85,"North America, Europe",18-35,University,Publication year and real monetary rewards moderate IGT performance; gender differences minimal (r~0.05),0.25,Pearson r,1994,"Buelow & Suhr (2009) meta-analysis"
Iowa Gambling Task,500+,70,"USA, Europe, Asia",25-50,Mixed,Age moderates performance: older adults show lower net scores; computerized vs card version shows minimal differences,0.3,Pearson r,1994,"Toplak et al. (2010) meta-analysis"
Risk Aversion Tasks (BART),300+,50,"USA, Europe, UK, Netherlands",20-35,Mixed,Higher impulsivity linked to poorer risk-calibration; risk-taking peaks mid-task then declines; ANOVA p<0.01 across blocks,Small,ANOVA p<0.01,1999,"Lejuez et al. (2002)"
Risk Aversion Tasks (BART),300+,45,"USA, Germany, Netherlands",18-40,University,BART scores correlate with real-world risk behaviors (r=0.3-0.4); significant individual differences in risk tolerance,0.35,Pearson r,1999,"Lejuez et al. (2002)"
Risk Aversion Tasks (Holt-Laury),300+,80,"Global: USA, Europe, Asia, Africa",18-65,Varied,~30-40% of participants classified as risk averse; CRRA coefficients typically between 0.3 and 0.9,Medium,Cohen d ~0.5,1995,"Holt & Laury (2002)"
Delay Discounting,2000+,100,"USA, Latin America, Europe",18-50+,Varied (low to high),Participants strongly prefer $50 now over $100 later; hyperbolic discount rate k=0.1-0.3 in healthy adults,Large,k=0.1-0.3,1981,"Mazur (1987); Rachlin et al."
Delay Discounting,2000+,120,"USA, Europe, Latin America",18-60,Varied,Steeper discount curves in lower SES groups; impulsive choices predict financial difficulties and debt,Large,Explained variance 20-40%,1981,"Bickel & Marsch (2001)"
Delay Discounting,2000+,150,"USA, UK, Germany, Brazil",20-55,Varied,Substance users show steeper discounting than controls; delay discounting predicts addiction treatment outcomes,Large,Cohen d ~0.8,1981,"MacKillop et al. (2011) meta-analysis"
Delay Discounting,2000+,90,"USA, Europe, Japan",18-45,University,Age effects mixed; older adults sometimes show less impulsive discounting; gender differences small,Medium,Cohen d ~0.3,1981,"Green & Myerson (2004)"