"Students in both asynchronous and synchronous settings performed well. However, students taught using asynchronous videotaped lectures had lower satisfaction with the method of content delivery, and preferred live interactive sessions or a mix of interactive sessions and asynchronous videos over delivery of content using the synchronous or asynchronous method alone."
I think this is more of the article we had to read for class, but I am citing it here as there is more to it that I want to use. Describes how questions are the driving force of thought. Also describes the Socratic method in depth.