This study assessed the effects of an imagery intervention with motivational general-mastery (MG-M) content upon individual collective efficacy perceptions for a novel obstacle course task. Following an introductory orientation session participants (n = 24) were allocated into teams of 3 and assigned to either an imagery (n = 12) or control stretching intervention (n = 12). Each participant completed a 6-week intervention program with weekly supervised sessions. Collective efficacy and task cohesion was measured during the baseline and post-intervention sessions using the Collective Efficacy Inventory (CEI)  and the task factors of the Group Environment Questionnaire (GEQ) . A mixed 2 °— 2 ANOVA determined a significant main effect within groups between the baseline and post intervention collective efficacy scores. Significant interactions between time and group were also observed for collective efficacy scores and both task components of the GEQ. The results provide initial support for the use of imagery interventions with MG-M content to enhance individual perceptions of collective efficacy.
- collective efficacy