I'm of the opinion that our thoughts should be private. Ours and ours alone. But because of the link between our thoughts and vocalization/subvocalization that's no longer the case. The weak point that's been exploited in the thought to vocalization/subvocalization is infrasound.
Try turning on your cell phone and starting up an app that uses the acceleromenter (a highly accurate one in fact) to detect infrasound. You'll probably get some kind of reading anywhere you find yourself, but try this:
Raise the phone up to your throat and gently place it in contact with it. Then say a few sentences out loud.
You probably can't see the screen anymore. But if the app can log the readings you'll still be able to see the phone captured information about your speech externally from your throat. It works the same when you subvocalize (whisper, speak under your breath, shape the words in your throat without opening your mouth). Infrasound doesn't carry through the air that well. It prefers to travel through solid objects. But when you're using a cellphone the distance is negligible and the infrasound carries to the phone just fine.
Of course you're thinking that our speech needs more than just the throat before it can be understood. The words are formed by the tongue, lips. etc. too. You'd be absolutely right if it was another person that was listening. If you replace a person with a computer you'd be surprised how much can be understood from just your throat.
There's also some pretty nasty ways to guarantee a person is heard by their phone even when they aren't using it to talk (maybe surfing the web or just catching up on work) and when they aren't talking out loud... only just to themself. Won't go into that here. It usually isn't something we'd be aware of when it's done anyway.
But just like that you're thoughts are on tap.
On a related note... I'm trying to locate a group of people or business that uses a phone technology that works even when the phone is off (one way though). And it just so happens they use tricks of perception to make it look like they have the technology I've just described. I have a feeling there's a connection to the casinos so they might work as both casino security and private investigators.
Why am I trying to locate them? I'll give you one guess...
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