From the British Psychological Society blog: Engaging lecturers can breed overconfidence.
The students who’d seen the smooth lecturer thought they would do much better than did the students who saw the awkward lecturer, consistent with the idea that a fluent speaker breeds confidence. In fact, both groups of students fared equally well in the test. In the case of the students in the fluent lecturer condition, this wasn’t as good as they’d predicted. Their greater confidence was misplaced.
I’m speaking at a couple of conferences later this year (iOSDev UK in Aberystwyth in September and NSScotland in Edinburgh in October), and will endeavour to be exactly as exciting as the material deserves: a capability to which my track record can attest.