Hi and welcome
"sticky" threads are ones that are pinned to the top of the forum
so if you are looking at the forum main page, you will see the "sticky" threads at the top
http://neurotalk.psychcentral.com/forum20.html
you have posted this on one of them...LizaJane's "sticky" thread
A thread is an series of posts on a specific topic while the forum is comprised of many threads and pages
hope that helps