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Fairly easily... We could do a lot of this now if we wanted. Lie detectors can kinda be used to know what someone is thinking, but requires cooperation since the subject still needs to say whether something is false / truthful.

If we could tap into someone's brain then we could simply ask a question and find out if they're recalling an event from memory, or whether a statement like "do you know where she is" is truthful. More advanced modelling of someones brain activity can even pick out specific thoughts so there's various ways to extract information from people as this technology progresses.

Although my guess is that none of this is required. An advanced AI model could probably learn your to understand your subconscious muscle / eye movements well enough to extract information without anything more invasive. For example:

1. "Do you know where she is" – AI says he's thinking yes

2. "Is she in the US?" – AI says he's thinking yes

3. "Is she in Texas" – AI says he's thinking yes

And so on until you have the information you need.

If we could tap into someone's brain then we could simply ask a question and find out if they're recalling an event from memory,

I do not think this would work on me. Not even slightly. And I'm having some real trouble understanding why you think it would work on you. When people claim to be able to beat lie detector tests, it's about involuntary reactions and their ability to voluntarily control them. I don't think I have ever been able to affect how much or little I perspire or my heart rate.

But my cognition? It is effortless. How will you "pick out my thoughts" when my thoughts are on pause?

2. "Is she in the US?" – AI says he's thinking yes

AI says he's thinking about poodles, and how much effort is put into trimming their hair when they might just be sheared bald like sheep. He's also thinking about use human feces in a stew and feeding it to the PTA at their next potluck. Now he's thinking about DROP TABLE ai_prompt_index...

AI OFFLINE.

Seriously, like, if I ask you a question, you can't help but blurt it out into your mind? Christ, I have superpowers and apparently never knew it.

That questioning methodology reminds me of Daemon/Freedom(TM): https://en.wikipedia.org/wiki/Daemon_(novel)

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