[nnmg]

I don't know, I think that is a big jump and definitely not trivial.

"Reading" neural activity is much different than "writing", and modifying the circuits/neural activity precisely enough to modify emotions.

These devices are typically cortical surface level electrode meshes, placed over the motor region of the cortex, while emotions are thought to come from various deep brain structures. Not saying it won't happen, but we are much, much, further from the latter than the former.

[tachyonbeam]

I don't know about that. You're right that emotions seem to come from deeper structures, but these structures are also more primitive. We're able to modify emotions with something as simple as amphetamines, so controlling them with a few well-placed electrodes is maybe not so difficult. Seems to me that as brain interface technology starts progressing, we're going to hit an S-curve of technological progress that will make it advance very rapidly in one or two decades.

[nnmg]

It's definitely possible, but I guess what I am saying is that research in this area hasn't really been explored in the context of humans.

In the lab, we use targeted genetic manipulations such as optogenetics [1] or chemogenetics (see DREADDS [2]) to achieve precise circuit manipulations that can (maybe/kinda) change emotional state (see [3] and [4] for manipulation of fear in mice, sorry may be pay-walled check sci-hub). But these are impractical in humans at the moment because they require specific genetic backgrounds (a CRISPR modified mouse expressing a specific artificial DNA sequence in certain types of neurons from birth), viral injections to add other genetic constructs that interact with the from-birth one, and implanting lights or adding drugs directly to the brain where the cells are. Precise electrical manipulation is not really done, even in animal labs because it is not precise or controllable for these types of things.

Again, I have no doubt that we will get there, maybe in a few decades too. But the techniques are much further from human use than the "reading" technology demonstrated here.

[1] https://en.wikipedia.org/wiki/Optogenetics [2] https://en.wikipedia.org/wiki/Receptor_activated_solely_by_a... [3] https://pubmed.ncbi.nlm.nih.gov/28288126/ [4] https://www.nature.com/articles/npp2015276/

[scsilver]

Terminal Man is a fun read. https://en.m.wikipedia.org/wiki/The_Terminal_Man