The Mueller-Lyer and Poggendorff space perception activities are online experiments done alone or with a partner. The Mueller-Lyer exercise provides two horizontal lines, a longer one on top and a shorter one on bottom, with the longer one being slightly more to the right. The subject uses the "E" and "Q" keys on the keyboard to make the shorter line longer or shorter after being instructed to make the lines the same length. The Poggendorff activity also tells the subject to use the "E" and "Q" keys to line up two diagonal lines so that they are evenly spaced. Both activities prompt you to alter certain settings to show how this changes the activity.
The dominant eye perception activity is easy to do. Point to an object in the distance, keeping your arm in front of your nose. Close both eyes, and then open each individually. With one eye you will be able to see the object and with the other your arm will be obscuring it -- the latter is your dominant eye.
You can do a perception activity that illustrates the filled-duration illusion. Find a friend, a stopwatch and a music playing device. Select a length of time, for example 20 seconds, and without telling your friend the length of time, count it on the stop watch. Then play a song for the same amount of time and ask your friend which period felt longer. Most people respond that the time with music felt longer because it was not silent.
The Bronx Cheer Bulb is a perception activity that prompts you to pull up a pattern of rows and dots on the site, stand ten feet from the computer and make a "raspberry" with your tongue. The pattern appears to move and you are prompted to vary the frequency of the raspberry. The website then explains that the pattern is not moving, but rather doing the raspberry causes your whole body, eyes included, to vibrate. The pattern is flashing on and off about 60 times a second and your eyes are in a slightly different position because you are vibrating.
An online version of Jeopardy! that specializes in sensual and perceptual concepts can be played alone or as a class or group activity. The categories are visual system, visual receptors, color vision, hearing, other senses, perceptual processes and depth perception. The game provides answers, such as "This aspect of light waves determines the color that we experience," and you are prompted to provide the question.