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You Actually Share Your Brain With a Silent Stranger

You Actually Share Your Brain With a Silent Stranger on HackerTube: recommended by 7 Hacker News commenters across 7 separate months, 2016–2025.

CGP Grey

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CGP Grey explains split-brain patients, where severing the corpus callosum lets the two hemispheres act independently. He uses this to explore the idea of two minds in one head.

Why Hacker News recommends it

HN returns to it constantly in consciousness and decision-making threads as a clear, entertaining explanation of split-brain.

people recommended it
7
separate months
7
strong recommendations
1
discussed on HN
2016–2025
“I recommend watching this video by GPGrey, one of the best educational channels on YouTube”
— otto_ortega, Jan 2017, in “Split Brain Does Not Lead to Split Consciousness”

What HN commenters said

12 Hacker News comments link this video. Each one links back to its thread.

otto_ortegaJan 2017Strongly recommends

If you just learned that "Split Brain" was thing, I recommend watching this video by GPGrey, one of the best educational channels on YouTube: ▶ this video

in “Split Brain Does Not Lead to Split Consciousness” · View on HN

alexpotatoMay 2025Recommends

This reminds me of the following quote: "Coding largely involves the 'logical part' of your brain. It tends to not include the 'language part' of your brain. This is one reason why comments you add to code are so useful: they force you to engage both parts of your brain and therefore get better results. This is also why when you go to explain a problem to a colleague, you often have a flash of brilliance and solve the problem: you are reframing the problem using a different part of your brain and the different part of your brain helps solve the problem." I'm sure some readers here will say this is preposterous and there is no such thing as having "two parts of your brain". To them I suggest watching: 1. "You are are two" (about people with their corpus callosum being severed) ▶ this video 2. "Conscious Ants and Human Hives" by Peter Watts [link]

in “The language brain matters more for programming than the math brain? (2020)” · View on HN

tick_tock_tickOct 2021Recommends

Every time someone brings up consciousness I like to bring up ▶ this video . Split brains imply some very interesting ideas around of consciousness.

in “Spinoza’s God: Einstein believed in it, but what was it?” · View on HN

surroundAug 2020Recommends

This reminds me of two mind-boggling discoveries I’ve had about the human mind. The first is that the two halves of your brain act somewhat independently. And in rare cases, people’s left and right halves are “split” apart, and they act entirely independently - e.g. their left and their right hands will act separately, or even argue with each other. CGP Grey made a great video about this: ▶ this video The other is that most people have a “voice” inside their head - e.g. when they read, they hear their own voice inside their head reading; their thoughts are like sentences they “hear;” they could look in the mirror have a conversation with themselves. Some ~10% of people do not have this internal monologue. [link] [link]

in “A man who can read letters but not numbers exposes roots of consciousness” · View on HN

teddyhMay 2019Recommends

> how can there be two selfs in a single mind. Oh wow, do I have a YouTube video for you: ▶ this video ( You Are Two , by CGP Grey)

in “Self-distancing can help you make better decisions” · View on HN

glennerooApr 2018Recommends

Kurzgesagt[0] and CGP Grey[1] did a fun little 2-part intro into "split mindedness" i.e. the idea that we may have multiple consciousnesses(?) contending for control. [0] [link] [1] ▶ this video

in “The limits of information (2014)” · View on HN

Show 6 more comments
BoppreHNov 2016Recommends

For mind bending check the great explanation from CGP Grey, "You are two"[1], which argues the two brain hemispheres can operate independently. [1]: ▶ this video

in “My Subconscious Is a Better Developer Than I Am” · View on HN

teekertOct 2024Cites it

Consciousness must be much more high level than microtubules and quantum effects. I think the split brain "experiments" (not really experiments [0, 1]) are much more useful than the experiments presented in tfa. [0] [link] [1] ▶ this video

in “New research on anesthesia and microtubules gives new clues about consciousness” · View on HN

throwaway3093Jun 2023Cites it

Also, neurologically you are not one person. You are two: ▶ this video It's not hard to imagine the nearly constant competition that erupts between neural sub-networks in your brain -- their collective output signals vying to be the dominant signal. Just stand in front of a bowl of ice cream and try to predict whether you will or won't actually eat it. (Impulse control, etc) Sensory awareness is helpful towards guiding these competitions and impulses into a direction (and a longer term habit) that is more aligned with your longer-term values. Also helpful: engineering your environment. [link]

in “If I Know what's good for me, why am I sabotaging myself?” · View on HN

patmorgan23Jun 2023Cites it

You're probably right. We have a couple examples of this happening. There's the interesting quarks that people with split brain hemispheres experience. ▶ this video And dissociative identity disorder where there arguably multiple consciousnesses inhabiting the same brain. It is probably an evolutionary advantage that humans have a ( mostly) uniform singular consciousness.

in “Decades-long bet on consciousness ends – it’s philosopher 1, neuroscientist 0” · View on HN

midjjiMay 2021Cites it

Is it hard though? Or is the hard part ethics i.e. personhood, and because the terms are conflated that makes consciousness hard, since it means you cannot accept what consciousness is without needing to also define ethics. Drop the idea that consciousness is sufficient or required for personhood in favor for something more behaviourally consistent like cuteness or power, and things become clearer. There is a part of you which simulates social interaction by learning models of various other agents it has inferred the existence of. As can be expected from something which is looking for agents based on indirect clues, we know this part does struggle with accidentally assigning agency to things which clearly lack consciousness i.e that damned sharp rock you stepped on twice. This part of you is capable of simulating a finite number of simultaneous such agents at a time, meaning it will focus on, as a whole, being able to predict the actions of the agents most often observed. It is also why we would expect it to replace groups of people you only interact with as a group as a "them". It is also very common that the most significant agent to simulate would be you. Hence one of the models being simulated is you. This is what generates the perception of consciousness, why it is you yet separate. It predicts the cognitive bias of the mind body duality, yet maintains the perception of consciousness. A part of you is constantly trying to explain your own actions, but critically, while w

in “Making the hard problem of consciousness easier” · View on HN

branchlessNov 2016Cites it

You are two ▶ this video I always come up with good ideas when relaxed, usually when not working on the problem (showering / running). God why are they working us to death?!

in “My Subconscious Is a Better Developer Than I Am” · View on HN

Topics & tags

Neuroscience & the brainConsciousness & cognitionsplit braincorpus callosumconsciousnessneurosciencecgp grey