This one has been giving me headaches for about a year now.

Some time ago, I created an [AskReddit](http://www.reddit.com/r/askreddit) thread with the following title:

> 
> How do you **psychically** prepare for pain before a surgical procedure?
> 
> 
> 

I was mocked in the comments. Redditors were saying that *psychically* refers to psychics (people who supposedly contact the dead). However, when I looked it up at The Wiktionary, [the entry for *psychically*](http://en.wiktionary.org/wiki/psychically) states:

> 
> 1. in a psychical or psychic manner
> 2. mentally
> 
> 
> 

I was also told that the proper word I was looking for is *psychologically*.

A few months later, in another thread, in one of my comments I wrote:

> 
> To perform a proper backflip, you have to prepare not only physically, but also psychologically.
> 
> 
> 

And again, of course, I was mocked, because *now*, it turns out, I was supposed to use *mentally*, contrary to what I had been recommended before.

Could the native American and British English speakers of ELU tell me:

* Was I ever wrong in whatever I wrote to Reddit, or are Redditors wrong?
* Is there any difference between the three words in question?
* If there is any difference, how do I properly decide which/when to use?