Ssild...How Does It Work

Hi. I am a redditor who has been on reddit for some time, I just don't comment a lot. I recently encountered SSILD, and it seems simple. My question is, though, how does it work? I know what the procedure is and all, and I did a google search but nothing came up as to the neurological processes that allow SSILD to function. Can somebody help me out? I would really appreciate it.