Trainee perception of cognitive load during observed faculty staff teaching of procedural skills.

Teaching in the exemplar procedural setting of colonoscopy affected learners' cognitive load in mostly beneficial ways, yet even 'good' teaching activities had detrimental effects when used excessively. Teachers of procedures should consider learner experience, task complexity and environmental factors to modulate the modality, content and intensity of teaching to promote balanced cognitive load and learning. Teaching more reservedly during the procedure and taking advantage of pre- and post-procedure opportunities may help.