Systematic Review
Collective efficacy in sport
Bandura (1997) introduced collective efficacy as the team equivalent of self-confidence. The higher the shared belief that the team succeeds, the more individual members contribute. The plank rule directly activates this mechanism.
Bandura, A. (1997). Self-efficacy: The exercise of control. W.H. Freeman.
RCT
Social loafing and identification
Karau and Williams (1993) showed that social loafing (working less hard in groups) disappears when individual contribution is visible and measurable. The stop penalty makes contribution maximally visible.
Karau, S.J., & Williams, K.D. (1993). Social loafing: A meta-analytic review and theoretical integration. Journal of Personality and Social Psychology, 65(4), 681–706.
Qualitative
Shared responsibility in youth teams
Holt et al. (2008) showed through qualitative research that young athletes in teams with explicit collective norms score higher on perseverance and have lower burnout rates than teams with only individual norms.
Holt, N.L., et al. (2008). A grounded theory of positive youth development through sport based on results from a qualitative meta-study. International Review of Sport and Exercise Psychology, 1(2), 113–124.
Longitudinal
Encouragement and pain tolerance
Cohen, Ejsmond-Frey, Knight and Dunbar (2010) showed that team membership and actively encouraging others significantly increases pain tolerance through endorphin release. Encouraging is not soft behavior but physiology.
Cohen, E.E., Ejsmond-Frey, R., Knight, N., & Dunbar, R.I. (2010). Rowers' high: Behavioural synchrony is correlated with elevated pain thresholds. Biology Letters, 6(1), 106–108.
Collective accountability team sport
How top teams build collective responsibility without a blame culture
collective accountability team sport culture psychology
Social loafing in sport
Practical explanation of social loafing in teams and how to break through it
social loafing sport team individual accountability