12/21/2023 0 Comments Shaking eyeballsSo that's what it looks like is going on. But when omnipause neurons are turned off, you we get these rapid back-to-back oscillations – the saccades. Normally, those neurons allow you to make a focused rapid eye movement to a new target. In order to do that, you use neurons in the brain stem that are normally active, and which stop the eyes from oscillating back and forth. So when you move your eyes, you make rapid movements called saccades. There's a population of neurons in the brain stem called omnipause neurons, which exist to allow us to make quick eye movements. In this case, it's not technically nystagmus but these things are very similar: they're involuntary wobbles of the eyes. I've found some videos on YouTube and it looks to me more like what you would call opsoclonus. Having said that, there are reports of other drugs – things like cocaine, for example – causing something called opsoclonus, which isn't quite nystagmus but it's very similar. VICE: Hi Dr Dunn, can you tell me why our eyes wiggle when we take MDMA?ĭr Matt Dunn: There are reports of nystagmus occurring with MDMA but no direct studies have been done looking at it specifically. So I got in touch with an expert – Dr Matt Dunn, an optometrist and lecturer in visual perception at the University of Cardiff – to chat about eye wiggles, how our body creates them and what their long-term effects could be. I figured it would be worth asking someone who understands how eyes work and just how much involuntary nystagmus can affect the body. ![]() ![]() Sometimes I couldn't see and I thought i was going to fall over," they continue, "but I could feel my eyes flickering back and forth so fast that I could see two or three of everything." A forum post from as far back as 1999 sees a user describe a pill that gave them "gave me the most intense eye wiggles I have ever experienced. This is that involuntary, quick-flickering-eyes feeling, well-known to the kinds of people who ask the /r/drugs subreddit if this is totally fine or if they're dying. That's not to be confused with acquired nystagmus, which is usually caused by a head injury.
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