Educational research has established that learning is more effective when it combines visual and audio, known as the Modality Effect (Reiser & Dempsey, 2012). This combination reduces cognitive load, which allows the learner to retain information more effectively. We decided to create educational videos for our math classes using a highly engaging technology called a lightboard. A lightboard allows instructors to speak to the camera while writing on a clear glass in front of them, thus avoiding having to turn their back on their students to write.
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Can a very similar result be achieved using a tablet that projects on the wall behind you?