Sound illusion discs sure are a headache. Next thing you know, they'll start hypnotizing people with masks...

If you ever try to calculate foxy’s speed again, please take into account the fact that 6 hours go by in 9 minutes

an ad happened when the low noise was played, I was getting ready then "HO HO HO this Christmas-"

I first read about the Ghost Frequency on Cracked 13 years ago, so when everyone else was ranting about how insane sound illusion disks are, a little voice in my head kept going, "It's... the frequency!"

3:26 Correction: they are multi-layered animatronics with rubbery plastic exteriors that are cracked in various places. They have regular functioning joints, as well as a mock springlock endoskeleton inside that only exists to kill people. TheNickofTime has a pretty good set of videos showing off novel-accurate models of them. 18:10 A big issue is that they're inconsistent. In some cases, they just change visual perception, but in others, they're practically magical in how they can warp reality. Other people more well-versed in the novels (and Frights) have more insight on this than I do. As I understand it, they're often used as a sort of "excuse" plot device. 19:48 Yeah, but at least those concepts are largely internally-consistent. I think you may have used a logical fallacy? Okay, that's a pretty good end bit.

The Novels do go into quite a bit of detail on how they supposedly work. Although it's still a stretch to say they're possible in real life, I feel they do have at least a little better backing than the video suggests. I think the concept is a little muddled here (no offence). Although ultimately I do believe they wouldn't work anyway, lol. At the start of the book Charlie's professor is talking about how your brain handles and filters all the sensory input it has to deal with: “Your eyes deceive you every day, filling in the blanks for you in a world of sensory overload.” (...) “When I say ‘sensory overload’ I mean that quite literally. At every moment, your senses are receiving far more information than they can process all at once, and your mind is forced to choose which signals to pay attention to. It does that based on your experiences, and your expectation of what is normal. The things we are familiar with are the things we can-for the most part-ignore." I'm not gonna pretend like I've done hours of research to verify, but from what I have read it seems like FNaF's logic here is decently sound, if not a little simplified. IRL your brain does screen out unneeded information based on what you need to pay attention to, like when listening to a conversation while music is playing. The logic the illusion discs work on is overloading the senses, not trying to induce a specific image for you to see. It does use frequencies that only your subconscious can perceive, but the main point is that its multiple frequencies that keep you busy trying to find a pattern that's not there: “The disc emits five sound waves that continuously vary in frequency. First they match one another, then they don’t; they go in and out of harmony, always on the edge of forming a predictable sequence, then branching away.” (...) **“The tone fluctuations happen so fast that they’re only detected by your subconscious**. Your mind goes mad trying to make sense of it; it’s immediately overwhelmed. It’s like the opposite of white noise: you can’t follow it, and you can’t tune it out.” The illusions rely entirely on your own memory and perception, in this case its your perception of the animatronics which changes person to person: “It’s-it’s some kind of transmitter, embedded in a disc,” Charlie said. “It scrambles your brain, cluttering it with nonsense so that **you see what you expect to see.”** “Because you already have those images in your head,” John said. He tore the Freddy poster off the wall and stared at it momentarily before letting it fall to the ground. “But we know better. We know they’re monsters.” “And we’re afraid of them,” Charlie said. “And so we’re seeing them for exactly what they are,” John concluded. Charlie also explains that you likely don't register what a stop sign really looks like, your brain just assumes. Again, I've not done much research on this myself but even if the actual disc frequencies method probably wouldn't work or be remotely impactful enough to have the effect, I can kinda see what they're getting at. Or trying to. Hypothetically if you could **force** the brain to pay attention to something it wouldn't be able to make sense of while you're not conscious enough of it to tune it out (If that's even required?), maybe you could assume what the animatronics looked like based on your own memory, similarly to the stop sign example. Like you're paying attention to a conversation you don't even know you're part of. But the thing with that is I feel your conscious perception of the giant killer animatronic in front of you would probably win out anyway just as basic survival instincts would make you focus on danger. Surprisingly I couldn't find many studies on the effects of 7ft tall kidnapping mascot suits on the mind. Weird. Cool video anyway! I don't think ghost frequencies do much for me but I want to look into it more

Unfortunately, I don't think the discs could produce any low frequency tones. According to the books the discs are coin-sized, and the only device I can think of that could fit the size factor would be a piezo speaker. These have a frequency response from around 1kHz to well over 20kHz, so a super high frequency sound is absolutely possible, but low frequencies are out of the question since a piezo or any other small driver cannot produce an audible frequency that low. But than again this is the fnaf universe where almost anything is possible.

When you played the ghost frequency i only felt my eyes vibrating a bit for a moment.

There’s no doubt Matpat is gonna watch this video, and spend about 40 minutes or over that. XD You my friend, have a gift. Keep up the good work. 🙏😀👍

Sound illusion disc's don't cause illusions in themselves. It's explained that they're meant to create distortion in the mind. Similar to how a.i takes noise, and static and uses to create a new image based on prompts to create a.i art. The idea is that these sound waves will cause distortion causing your brain to create new images based on your memory, and perception. They basicly just distract you so that you don't see clearly what's right in front of you.

it might just be power of suggestion, but the frequency made my vision have some dark blotches kind of similar to when you get up too fast sometimes

My eyes feel a little weird after hearing it… but when you played the ghost frequency… I felt it vibrating in my ear buds… almost to the point where you can say I can hear it

Didn't hear anything from the Ghost frequency... Did feel something when you constantly wrote hZ instead of Hz though! Really enjoyed the video

I don't know anything about sound illusion discs, but if i take the interpretation literally, using sound to create visual illusions, i can see that there is IRL holographic display where you can see hear and feel the holographic object by suspending a small plastic bead on a standing pressure wave emitted by an array of small speakers, and casting light on it. And while current technology relies on two desks full of tiny speakers opposing each other, maybe you could use ANC (active noise cancelling) to suspend tiny particles, like dust, that is already present in the air, against ambient noise, and cast the holographic image on them, making the device portable and barely visible, since you can hide it inside of the illusion. Bonus fact those holograms can appear blurry, or incomplete, or perfectly revealing how it works based on your shutter speed

Not gonna lie, the Ghost Frequency got me on edge... but nothing more than that.

The Dittophobia gas feels like some blatant confirmation of how FNAF 4 works, ESPECIALLY with all the gas tanks in Sister Location, a game Scott has said was created to craft the story into something better (this was right after Dream Theory)-- the thing is, if this is the case, why did he make the Twisted Ones almost a full year after Sister Location and make it all about sound illusion disks if it was supposed to be gas the whole time?

The sound the illusion discs emit can actually be heard. Maybe it's because she's a robot, but Charlie can hear it. She also explains exactly how the discs work (The Twisted Ones, pg. 164-165). "In class we learned that when the brain is overstimulated, it fills in the gaps for you. So, say you pass a red hexagonal sign on the road, and someone asks you what words were on it. You'd say 'STOP.' And you'd imagine that you saw it. You'd be able to picture that stop sign the way it should have been. That is, of course, if you were properly distracted and didn't notice an obviously blank sign. This thing distracts us. Somehow it makes our brains fill in blanks with previous experiences, the things we think we should be seeing." "It's a pattern, sort of. The disc emits five sound waves that continuously vary in frequency. First they match each other, then they don't; they go in and out of harmony, always on the edge of forming a predictable sequence, then branching away." "The tone fluctuations happen so fast that they're only detected by your subconscious. Your mind goes mad trying to make sense of it; it's immediately overwhelmed. It's like the opposite of white noise; you can't follow it, and you can't tune it out."

I GOT AN AD FOR CHICKEN STRIPS RIGHT BEFORE THE FREQUENCY AND IT BLASTED IN MY EAR LMAO 😭

Wellllll, if you combine the disks with the gas which is stated to put some in a state of both sleep even if they are awake, then it could work! The only question is what is in that gas 🤨

The frequency made my limbs go cold.

When you played the ghost frequency the muscles in my chest actually clenched together and i had trouble breathing but not to much then my legs started vibrating

when he played the sound, gonna be honest, I felt it hard to breathe for a few seconds!! so weird!!! "Illusions in the shadow..They terrify you. Scare you to your core..Can you feel it? Can you feel the reality of your non-existence crawling on your back, entering your head? I am real, so you must believe." -Reality

i hear a lot of videos about the 18.98hz but anyone maked me feel anything, but when in this video where played i actually felt something

So, if the ghost frequency can make you feel fear and stress; and both fear and stress can mess with your digestion, causing constitpation or diarrhea; could the Ghost Frequency be considered a “Brown Note”?

i think it also emits light frequencies so basically it's a labrynth of sounds smells and misdirection

vaguely off topic but i remember physically flinching once at some random curtains and such down the hallway because my brain registered it as a person for a split second, lol

This guy is so underrated, he really deserves more subs!

I see your point with the animatronics, but it's not exactly that hard to imagine. Walking robots during the '80s were around. The problems are the costs of the necessary parts and the amount of time needed to perfect the mechanisms, which is why they were mostly limited to universities. Waseda University, for example. It took five years (1967-1972) for them to perfect WABOT-1. But thanks to the lessons learned from it, they made WABOT-2 in 1984, which could play the piano. Henry and Will definitely faced similar issues, and these are enough to discredit the game's core concept. But if they experimented behind the scenes and picked their materials carefully, they may have made their free-roaming animatrons possible. Which could also help them budget-wise since the business gives them a steady source of revenue. Not a lot in terms of a local pizzeria chain, but still enough for the basics.

when the sound played i did actually feel my chest tighten slightly.

18.98 is not inaudible to me at all in fact on my speaker i can hear frequencies of 1 so there is something wrong with it :(

Was half asleep dozing off, but then 6:43 happened, and it scared the hell out of me

I really appreciate the recap at the end of the video. I also get lost on what the point of other videos, with out the recap, is about 😅

The child got up AFTER his body regained that moving ability but yet agian he does do stuff...

This was some fascinating analysis and research! But to make a wayyy more important note: I loved the execution of the rickroll. Beautifully subtle, 10/10

(Context: I was washing the dishes as I listened to the video) When you played that 18.98 Frequency, my whole body did start to shake. I don't know if it was a placebo affect because of how you described it, but I felt my arms start to tighten and overall uneasy. It didn't feel like life threatening or anything, but I felt something. And it went away when you turned it off.

The thing with the "ghost frequency" is that, because it's so low-frequency, you probably won't "hear" it through normal speakers, and it's pretty likely to be filtered out of any compressed video file, as it can cause aliasing. You'd need to be a decent distance away from the source of the sound because of the wavelength, and tbh, based on what we see of the sound illusion disc, I don't think they'd be able to *produce* those kinds of frequencies - they're just way too smol.

This really reminds me of the good ol Game Theory episode, in the best way possible. Looking forward to the next one

Now I want to make a sound illusion disc with the ghost frequency IRL.

Just to note since i did have an interesting response to the tone, my hairs stood straight up when hearing the tone, felt nice actually lol

I thought you were going to make a joke about the low frequency being the dreaded “poop note”

I felt like something was trying to crush my ahead, but it wasn't strong enough to do it. I can't say if you really played the sound or not (we can't hear it), so I searched it and heard myself... same feeling.

Never had a problem with sound illusion disks, this is a series where ghosts haunt and move giant robots that can be melted down to spirit metal and turned into tangle of wires with a mind of their own. In the end sound illusion disks are a way to explain how someone could make scary killer robots without rising supsion on why there buying a bunch of really sharp metal teeth

I felt a little off when playing the ghost frequency sound but nothing crazy so that’s interesting

I am very excited for the live stream!

All the ghost frequency did was make my head shake slightly. Still, it was freaky even if it wasn't that intense.

Didn't feel anything from that frequency, but I did actually hear a faint buzz. Granted, I have extreme hypersensitivity, so I do sense things that most can't. My input probably doesn't apply for the average human brain. ;w;

Interestingly, as someone who is hearing impaired and has trouble hearing high pitched sounds, I can still feel them. For example, I can't hear fire alarms, but if I'm close enough to it, I'll feel that vibrating sensation. So often times, I associate that feeling with high pitched sounds and was not aware it could happen with low pitched sounds too. I've never had any other effects from hearing certain pitches though lol, just the vibrating sensation. Edited to fix a mistake.

I could actually hear a very dim and low wave during the 18.98 hZ frequency segment. I did feel the slight tightening effect and hair standing up, but no visual oddities.

Demons are most likely skinwalkers or something similar which can go to uncanny valley

9:52 I was getting ready to work while listening. You made me look at the video because for second, literally, I felt like my tablet had broken until I saw he text, and even then there was anothersecond before I realize what you had just said. in the third second i 5hough all was okay. And in the fourth second...I still didn't like my headphones making that sound and tried to focus on your voice for comfort since I was...home alone...At least I THINK i am... 10:56 EDIT: maybe THAT'S why i stopped and cautiously looked over to my tablet playing the video and away from my computer I had been logging on to...

when the ghost frequency played I didnt experience any of the sympoms listen, but isntead my legs felt cold and went back to feeling normal when it ended

I think I'm a little confused on the ghost frequency because I did hear it, but the science said humans can only subconsciously hear that frequency?

Not gonna lie i didnt feel anything when you played the frquency, but when you first started talking about it causing your body to shake i started shaking slightly which scared the hell out of me.

I don't get why some people make a big deal about the illusion device. It is a fictional device used by fictional characters in a fictional video game series about dead kids possessing animatronics. 😐 Yeah, it is silly and a bit dumb, but is this where we draw the line? Anyways, great video as usual!

Wow 18.98 Hertz Actually Worked

10:15 for all of yall with panic attacks.

I personally think they un-canonized Illusion disc's since in the Dittophobia FNAF 4 is revealed to be cause of Nightmare gas and generally halucination gas makes more sense against a disc that is way too complicated for their own good

ngl the ghost frequency is just the placebo effect

How are the illusion discs any worse than the nightmare gas

Nope I feel nothing

Wait. I heard something. And had a bit of goosebumps. I tried it again. Something is just there i hear it. Like, the sssssssss when it's silent. But, it isn't silent.

What about a totally awake person who has schizophasia reacting to the disc's?

I Can ear the ghost frequency and even if the song just destroy mi ear, it really afect me, this IS terrifyng

18:27 That joke got me lmao

9:50 I actually feel more comfortable when listening to it😅

this dude is the next game theory

I just felt a bit warmer

Good video, thanks for making my day

I Can ear the ghost frequency and even if the song just destroy mi ear, it really afect me, this IS terifyng.

This is a good video. This is a good channel. Good job. I'm subscribed now.

10:15 my eyes started watering up?

ive had sleep paralysis, guess im lucky i always had my eyes closed, or was face down, the hardest part is breathing, because for some reason i can control my breathing when i am in sleep paralysis, and thats kinda hard with my diafram not moving, though i can also slightly move my finger or toes, so i keep doing that until i can move again.

I can't feel anything because my cat won't leave me the hell alone.

i have just finished the part with the 19.98 hz and all it did was make me laugh, this usally happens to me when some illusion is going on, especially sound related ones, does anyone else get this???

I heard the dread sound but felt nothing. I even tried my headphones (which is how I was able to hear the sound in the first place), but still nothing

Hated? Aw, I always thought they were pretty cool!

Didn't hear the ghost frequency but I'll try it with my headset maybe it works. Though my eyes vibrate by themself sometimes for a bit of time so I wouldn't find a difference there Okay, I listened to it and well... It was like listening to a speaker with an old/bad plug connection and makes this static booming sound. I kinda liked it

18.98hZ made my stomach like feel weird like i think the mild tremors you said? worst part i was eating and it was so wird like- it felt like my stomach was sucked in kinda compressive state idk felt bad when it did that right as food was going into my stomach

tch, when u mentioned the frequency i immediately searched it up and kept it playing in the background and i got admit, i was feeling a bit suffocated. when i turned it off however things immediately got better, freaky stuff, although i did not get any hallucinations or shadowy figures.

if youre still wondering, pah-ree-doh-lee-ah is at least the more accurate pronounciation to the word's original language (greek)

It's just making me sick.10:08

I think I heard of sound illusion Disks before. In Classic Ben ten, wasn't there was that hypnotist villain with the Clocks?

so, for the low pitched sound, I felt my chest vibrate but I also heard it, did anyone else hear it?

Which animatronic is the most dangerous based on what they can do, in game?

When to frequency started, my eyes started vibrating and i saw a black figure.

There's no way i just got rickrolled in a video talking about five nights at freddys sound illusion discs. Edit: my house might have 18.98Hz everywhere because im always seing stuff in the corner of my eyes

How is no one here! This is cool

oh look a dear -GLaDOS

what if that the jumpscare sound from nightmare from fnaf 4 is this very deep sound of the disc :O!

not to completely ruin the whole segment on 18.98 hz, but most consumer grade headphones and speakers(unless you have a subwoofer) cant reproduce sounds typically as low as 30hz, most of what was being replayed around 10:00 was just overtones

I really enjoyed this video, but it brought up something I’ve always wondered about. Why do people hate Sound Illusion Discs? When they were first introduced, I found them to be extremely cool and interesting, and I never really cared about how they worked. Is this just me?

wait is it bad if i could actually like hear the Ghost Frequency?

yeah ok but when are you gonna do fazgoo?

10:01 how can i hear it?

This was a really interesting video

Was about to hear the goth frecuency and a f***ing ad appeared

the sound illusion disks were retconned by the books

10:11 anyone who would be feeling it could be because of you describing it not sure whats its called when you trick someone into feeling something that their not actually feeling

wait, youre not supposed to hear the ghost frequency, right?

Bro is the vsauce of fnaf