Behbahanabadi, M., Saemi, E., Doustan, M., & Iwatsuki, T. "The Effect of Enhanced Expectancy on Motor Learning, Intrinsic Motivation, and Self-Efficacy: A Comparison of Relatively Easy and Difficult Success Criteria", Sport Psychology Studies, 14, 53, 2025, 1–24. doi: 10.22089/spsyj.2025.18464.2602