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Original Research
Published 25 August 2026
Sex-related biological variation and mental toughness in soccer: a 2D:4D digit-ratio study of Type a, Type B and Type C classification across playing positions
Hamza Kaya Besler · Gulferi M. Yildirim · Sinan Canan · Sinan Seyhan · Görkem Açar · Muhammed Fatih Bilici · Uğur Sönmezoğlu
Frontiers in Behavioral Neuroscience
doi 10.3389/fnbeh.2026.1934922