I seem to know a lot of people who seem to flatline during classes (or grand lectures of any kind?). The below should be tested on a wider scale to see how effective Classes are for most students, the results may be surprising (and shocking perhaps?).
From “A Wearable Sensor for Unobtrusive, Long-term Assessment of Electrodermal Activity” (by Poh, M.Z., Swenson, N.C., Picard, R.W. inIEEE Transactions on Biomedical Engineering, vol.57, no.5), a chart showing a single student’s electrodermal activity over the course of a week. Note the neural flatlining during classtime. As Joi Ito notes, “Note that the activity is higher during sleep than during class.” He also adds, “Obviously, this is just one student and doesn’t necessarily generalize.”