Visual Perception and Memory Visual perception and memory offer various opportunities for group activity or learning. Perception can be a dry topic, but use of illusions to illustrate perception concepts livens things up substantially. Below are a few sample items I've used in classes to cover these topics. Memory is always a fun topic for me to explore with students, and we cover a broad gamut of topics. I wrote the presentation software, which can be configured to present images very quickly, to demonstrate that people still develop memories even for things they don't recall having seen.
Visual illusions are another favorite topic to cover.
As mentioned above, they can be used to demonstrate various principles of perceptual processing and organization. I have an ever-expanding library of illusions and Escher drawings from which to select for use in class. The Stroop effect in perception is a fun one to demonstrate in class. The effect reflects interference between perception and knowledge. I have one student leave the room, usually one who is more vocal or lively in class, and select a quieter student to participate and run first.