The Cognition and Language Laboratory at Harvard has a website where they get help on their experiments from regular folk like you and me. Trying to find thousands of volunteers to ‘drop by’ the lab isn’t always practical but asking for volunteers on the Internet has shown far more potential for obtaining large numbers of human guinea pigs. There are currently 5 experiments with which they’d like your help.  Take their tests and show these Harvard scientists a thing or two about cognitive learning.

http://coglanglab.org/index.html