Description of the study:
Below are several versions of the Behnam's Top. If you choose to participate, click on any or all of the versions. Your task is to veiw the flickering pattern and report if you see any colors and what those colors are. Please wait a minute or so as the colors are usually faint and not immediately apparent.
Informed Consent:
By clicking on any of these items I consent to participate in this study. No information about me will be gathered and my participation is completely anonomous. I will only participate once in any of the versions but I may participate in as many of the version as I want. The results will be available at this site at a later time.
| Version 1 | Version 2 | Version 3 | Version 4 |
| Version 5 | Version 6 | Version 7 | Version 8 |
Thank you for your time.
John H. Krantz, Ph.D.