The new 4chan captcha is an IQ test. If you've used them for a while and haven't figured out how to solve them without touching the slider, then you have low IQ. If you use the slider and still miss frequently then you have very low IQ.
The server side 4chan software tracks you by IP and by cookie and by browser profile, so they now have data on which posters are high IQ and which are low IQ or very low IQ. Sure would be interesting to see how captcha solving ability correlates with other characteristics amongst 4chan users, but unfortunate /iq/ is dead so there is nowhere to ask, so I'll just ask here:
What is your IQ, how much difficulty do you have solving captchas and what other beliefs do you hold?