Fun fact, the Zizian AI murder cult is similarly obsessed with the idea of two hemispheres being separate brains. They also believe gender dysphoria is a trait present or absent within each hemisphere.

Their long term goal was to abolish sleep by making one hemisphere of their brains sleep at a time, leaving the other to be awake. Supposedly this would allow them to work more and have more sex. In reality, they all simply went insane, committed pointless murders, and ended up in prison.

As it happens, dolphins and whales do this so as to not drown, and they consequently have an underdeveloped hippocampus and take 3x as long as primates to learn the same things.

Long story short: don't mess with your sleep or you might start a murder cult.

it does feel like quite the coincidence that 2 seems like the magic number and we do, in fact, have two hemispheres. i doubt that the processing for any of these tasks falls strictly down the left vs right hemisphere, but i do kind of feel like our consciousness is kinda built on having a sort of internal tick-tock cycle, and we do certain kinds of thinking on tick and others on tock. but that is just armchair introspective dilettante neuroscience-- not to be confused with the actual thing.

The article's EEG images don't seem to suggest this is due to two brain hemispheres.

I can't remember the book now, I think one of Antonio Damasio's? He recounted an experiment with a patient that had a severed corpus callosum where they put a wall between the eyes and showed him two different pictures, asking him what he saw, and he wrote one answer and spoke another, without any indication either half of him was aware the other half was inconsistent.

It was terrifying 20 odd years ago to read this kind of thing, but it's amusing in light of all the obsession with productivity hacking in Silicon Valley that I could almost see someone with a YouTube channel doing this on purpose to try and be able to accomplish simultaneous tasks a normal person would be tripped up on by the need for a normal brain to produce a single consistent narrative.