As a kind of brute-force proof-of-concept: it could be a series of instructions to poke your brain with an electrified needle of how to invoke the same thoughts

As a kind of brute-force proof-of-concept: it could be a series of instructions to poke your brain with an electrified needle of how to invoke the same thoughts. (It could be that they're different locations in your brain that have to be poked than the locations it would take in the sender's brain, but it's not a fundamental obstacle. Either the sender studies your brain to tell you where you should do it, or instructs you how to figure out the right spots.)