Little Bits Of Weirdness

I am always intrigued by the little bits of weirdness that come with the whole schizophrenia thing. 

For instance: a couple days ago I learned that most people cannot tickle themselves. I was reading an article about a study on what causes auditory hallucinations in schizophrenia (STAT: Health) and it just throws out the statement "Even the most ticklish person in the world cannot tickle themselves." I was absolutely dumbfounded by this statement. I just sat there for probably 10 minutes with my brain did a "WTF?!" Then I asked my parents if they can tickle themselves and I got a couple of puzzled looks. Yeah, apparently not. 

So I looked it up. Britannica has an article titled "Why Can't You Tickle Yourself" and it is an interesting read. 

The reason you can't tickle yourself is that when you move a part of your own body, a part of your brain monitors the movement and anticipates the sensations that it will cause. 

Now the reason I was so confused is that I can tickle myself, both inadvertently and on purpose. Just now I tickled my leg just for the hell of it and yep, it tickled. So what is going on? I found another article, this one titled "Can People With Schizophrenia Tickle Themselves?" And it added this bit of info: 

Most people cannot tickle themselves. However, some individuals with schizophrenia may be able to do so, possibly because they are less aware of the consequences of their movements.

So, weird, right? How have I reached the overripe age of 52 without knowing that the whole tickling myself thing was a symptom of my mental illness? It is baffling to be sure.