After analyzing the data produced by undergraduates who wore the glasses during
lectures, professor David Rosengrant concluded that it was not the case, as many
teachers believe, that students were most engaged for the first 15 minutes or so
of class, after which their attention gradually slacked off. Rather, he said,
student engagement ebbed and flowed over the course of the 70-minute lecture,
and spiked whenever the professor used humor, stood close to the student, or
talked about material that was not included in the Power Point presentation
projected on a screen at the front of the room. Rosengrant also determined that
cell phones and the web — especially Facebook — were the greatest obstacles to
maintaining students’ engagement in the classroom.