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Press the button below for a demo of the behavioral Size experiment, and follow the on-screen instructions. (a new window should open).

(Note: This is a Java Applet and you may need to install and enable Java in your browser. Most recent Java standard edition can be downloaded from Note for OS X users: J2SE 5.0 Release 4 or newer is recommended. If you are using earlier editions, you may need to run Java preferences utility under /Applications/Utilities/Java/J2SE 5.0/. See These applets are tested using the latest versions of Firefox browser