Hearing tinnitus seems to work according to different rules than hearing outside sounds for lisper.

Since tinnitus uses different mechanics and pathways, that seems plausible.

For comparison, think of a recently blinded person still dreaming visually. Or think of phantom pain.

They can hear the tinnitus, but not real sounds at that freq.

IANAD, is there any kind of "gain correction" theory for tinnitus? ie, the brain notices your ear can't hear this frequency very well, so it pumps up the volume ... maybe too much.

That would fit this data point, at least.

Weirdly, maybe not so different than when a hearing aid starts ringing.

You could have tinnitus at a frequency you can't hear if the tinnitus arises downstream of auditory issues that reduce hearing sensitivity.

For instance, if someone couldn't hear a certain frequency because the corresponding hair cells in their ears were damaged, they could still have tinnitus at that frequency arising from parts of the brain that process that frequency.

Mine starts as a high pitch and then I can’t hear anything out of that ear for a good 10 seconds.

Go back to the old question of if a tree falls in a forest, does it make a sound if no one hears it?

Tinnitus isn't caused by actual waves of air pressure on the eardrum. We'd not call that tinnitus (unless it was actually inescapable, eg. a perception of rushing blood flow), that's just an annoying real-world sound.

Hearing is connected to eardrum vibrations by a complicated system of the outer ear, eardrum, tiny auditory bones, the fluid-filled cochlea, tiny hair cells with sensory neurons, the auditory nerve, and eventually the brain.

When all these work properly, the brain gets accurate information about sound waves.

When those hair cells are damaged (or wherever the stimulus arises) to send bogus information up the auditory nerve, the audio perceived by the brain as a result of that stimulus is not necessarily correlated to any accurate frequency data that could make it through that pathway.

Not OP, but same problem. Interesting suggestion!

Is there some kind of resonance or something that happens at half/quarter that lets you identify it?

I experimented real quick and wasn't able to do a great job estimating half of a frequency from playing with the slider on the lower one. Wasn't _totally_ off, but nothing magical seemed to happen when I got to half.

You can actually hear the beat frequencies like tuning a guitar. So intervals like the fifth or an octave are definitely 'in tune' when you try it. Interestingly if you play a pure sine in each ear with one slightly detuned, your brain will also hear the beat frequencies as if the waves were interfering despite each ear getting separate pure signals! There was even an open source program Gnaural for experimenting with this effect - binaural beats.

Interesting suggestion. But no, I don't think so, and I'm having a really hard time describing why. It sounds like a pure sine wave, but it's so high I have a hard time relating it to any real auditory input.

Also, interestingly, since I started focusing on this it has gotten less intense.

Hearing loss is a physical problem. Tinnitus, often, is a signaling problem. The signal can represent a sound that the physical sensors can't produce anymore.

It’s two different sources, and a subjective tinnitus source is perceived but not “heard”, if that makes sense. You might be able to experience something perhaps similar: many people can hear much higher frequencies when the speaker is in contact with their skull than through the air.

It's a fair question, and it's hard to describe. What I perceive is a very high pitched pure sine wave. When I take a hearing test, my ability to hear real tones drops off long before I can hear anything approaching the pitch that I perceive. Does that make sense?

You're not actually "hearing" anything. For one, the sound (usually) does not actually exist. In many cases it's more like an inappropriate signal from a damaged nerve or some of the teeny tiny "hairs" within the ear that sense sounds.

Well, this is interesting. I was going to respond: I hear it even when I'm outdoors so it can't be transformers.

However, then I decided to check if my phone could hear it, so I fired up my DB Meter app. And funnily enough, there is a little spike right around 12kHz, which seems to be right around where my tone is. It's not a huge spike, but it's definitely there.

Weird.

I could hear flyback transformers growing up, too—-I could often tell from outside when someone had their TV on, even when adults couldn’t hear it at all.

Unfortunately, that frequency is a pretty accurate comparison to my now ever-present tinnitus. It’s not fun.

Because I can't actually hear that frequency. If I play sine waves through ear buds and increase the frequency, the highest pitch I can hear through the earphones is lower than the pitch I "hear" through the tinnitus.