Difficulty Level Moderates the Effects of Another's Presence as Spectator or Co-Actor on Learning from Video Lectures

Much effort has been put into the design of video lectures, but little attention has been paid to the social environment in which learning takes place. The present study addressed this gap by assigning Chinese undergraduate and graduate students who had passed the College English Test-4 to learn easy or difficult English vocabulary words in three different conditions: alone, in the presence of a peer spectator, or in the presence of a peer co-actor. In Experiment 1, participants learned difficult vocabulary words and the effects were measured by both neural activity (EEG signals, measured while participants watched the video lectures and during the generative learning activities) and behavioral evidence (learning performance assessed after having watched the video lectures: immediate and delayed test scores, cognitive load, and motivation). Repeated measures ANOVAs showed that learning alone was more beneficial than learning in the presence of a peer, as indicated by better learning performance and reduced EEG theta band power. In Experiment 2, participants learned easy (rather than difficult) English vocabulary words and outcomes were measured by immediate and delayed learning performance. Repeated measures ANOVAs showed that the presence of a peer was more beneficial than learning easy content alone. Combined data from both experiments showed that difficulty moderated the effect of social context. Participants performed best when students learned the difficult content alone, and when they learned the easy content with a peer present.