EEG revealed significant differences in brain connectivity: Brain-only participants exhibited the strongest, most distributed networks; Search Engine users showed moderate engagement; and LLM users displayed the weakest connectivity. Cognitive activity scaled down in relation to external tool use.
Over four months, LLM users consistently underperformed at neural, linguistic, and behavioral levels.
It seems intuitive but also 2000 years ago people thought that for example the eye emitting some sort of substance that interacts with the surrounding environment to be an intuitive explanation for how vision works, so intuitions need to be tested.
Damnit. Eye lasers would have been so much cooler though.