I know this is an old post but I just came across it while searching for yips in this subreddit. At least for me the answer is a resounding YES. When alone in a room, I am fluent and have no speech blocks. When speaking with people, I develop noticeable blocks. There have been times when speaking to someone where I forget for an instant that I have a perceived issue saying certain words and the word comes out smoothly and I'm pleasantly surprised. The anticipation of failing to say a certain word and the fear and shame involved leads to a block. This is classic performance anxiety or what is otherwise known as the "yips." When athletes are in their heads about trying to hit a pitch or make a put, they stumble. If you went out on a walk and had multiple negative thoughts on walking straight and balanced, you might all in a sudden feel like you have rubbery legs and feel like you're going to stumble. I've tried this on myself. I read an e-book by [Matthew O'Malley](https://www.amazon.com/s/ref=dp_byline_sr_ebooks_1?ie=UTF8&field-author=Matthew+O%27Malley&text=Matthew+O%27Malley&sort=relevancerank&search-alias=digital-text) that digs into this and it is intriguing. Essentially, we have to train our subconscious mind to stop perceiving certain words and situations as hazards. He posits an interesting theory - we have blocks because our subconscious mind is trying to protect us from shame and embarrassment so it tries to stop us from saying certain words and thus the speech blocks happen to avoid these situations. At least for me, the blocks are definitely performance anxiety related and I am working on becoming more self-aware on how I feel right before I want to say certain words. Also, why I look away when I say those words (to avoid looking at, what I perceive, disapproving expression). I am also looking for a hypnotherapist to assist me in tapping into my subconscious mind to reprogram it.