Original ResearchPublished 25 August 2026Sex-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 positionsHamza Kaya Besler · Gulferi M. Yildirim · Sinan Canan · Sinan Seyhan · Görkem Açar · Muhammed Fatih Bilici · Uğur SönmezoğluFrontiers in Behavioral Neurosciencedoi 10.3389/fnbeh.2026.1934922
Original ResearchPublished 19 June 2026Enhancing mental toughness among healthcare leaders to support employee engagementSpencer A. Cavan · Andreas StamatisFrontiers in Organizational Psychologydoi 10.3389/forgp.2026.1787997
