A replication of Triplett's 'social facilitation experiment'

A pre-registered Registered Report (Stage 1 accepted August 2022) replicating Norman Triplett's 1898 social-facilitation experiment with 445 school-aged children (mean age 10.8). Using a purpose-built crank-and-pulley apparatus, pairs of participants completed the task twice alone and twice together, with trial order standardized to control for practice effects. Participants completed the task faster in the together condition than in the alone condition, replicating and extending the classic finding that the presence of another person changes task performance, with additional variability by age and gender and carryover effects between conditions.