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Angela Pretorius
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1Angela Pretorius's Shortform
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I changed my mind about orca intelligence
Angela Pretorius6mo60

Cetaceans like orcas cannot sleep too deeply or else they will drown. They sleep half their brain at a time. Newborn orcas and dolphins don't sleep for the first month of their life. 

I suspect that cetaceans have had to dramatically lower their learning rate in order to survive on limited sleep and as a result they have only mediocre intelligence despite their huge brains.

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what an efficient market feels from inside
Angela Pretorius6mo10

Some landlords offer cheap rent but only rent to childless non-smokers who have a perfect credit score and a well-paid job (preferably a job that requires security clearance or an enhanced DBS check) and whose demographic characteristics are not too similar to those of their previous bad tenants. 

Other landlords are less selective about who they rent to but charge much higher rents to compensate for the risk of property damage and rent arrears. This is why properties that are very similar in quality may be charging at wildly different rents.

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Making Up Baby Signs
Angela Pretorius2y*50

These are some of the signs that my 27 month old late-talker has invented:

-‘sit here’: taps where he wants me to sit

-‘I want a banana’: points to a picture of banana in a book, rubs his tummy then points to the fruit bowl

-‘I want to go outside’ fetches his shoes, points to his feet then runs to the door

-‘give it to me’ opens and closes hands

-‘the bin needs emptying’ runs to the kitchen bin then points to a picture of a wheelie bin

-‘please sweep up the food that I threw on the floor’ points to the dustpan and brush, then points to the food on the floor, then makes a pretend sweeping motion with his hand

Letting him make up his own gestures is much easier than attempting to teach sign language to a toddler who is too busy playing to pay any attention.

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What do you think is wrong with rationalist culture?
Angela Pretorius3y30

That’s what the r/slatestarcodex subreddit is for.

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The Kids are Not Okay
Angela Pretorius3y30

A few thoughts…

Have schools dropped all the fun activities so that they can spend more time catching up on the lessons missed during covid? 

The teen suicide rate was declining over the 90s and early 00s. Then the No Child Left Behind act came into effect in 2003. Then the suicide rate gradually started increasing again. It is highly plausible that the no child left behind act would cause an increase in suicides, but I’m not sure why it would cause a gradual increase over many years rather than a sudden jump in suicide rates?

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On Cooking With Gas
Angela Pretorius3y10

Correction: Actually gas stoves are a significant source of pollution. See here https://pubs.acs.org/doi/10.1021/acs.est.1c04707

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Angela Pretorius's Shortform
Angela Pretorius3y-10

##AGI might not be conscious

###I don’t think that feedforward networks can be conscious

Integrated information theory does not allow for conscious feedforward networks.

###There is no good reason to expect AGI to be a recurrent neural network

Transformer models like GPT are basically feedforward networks [to do: check that this is correct]. Recurrent neural networks have had some successes but they are difficult to train. Whereas feedforward networks can be trained quite effectively using back-propagation. Biological neural networks are unable to implement back-propagation and instead rely on a variant of Hebbian Learning. To implement a recurrent neural network trained via Hebbian Learning on a computer wouldn’t necessarily be the best use of computational resources. AGI may very well be a feedforward network trained using back-prop.

###Anthropics All of human consciousness is about to be massively dwarfed by an enormous explosion of superintelligent, highly conscious AIs. And by some incredible co-incidence I happen to be human???

It just seems so implausible. An explosion of unconscious or minimally conscious superintelligent AIs is much more plausible.

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Schizophrenia as a deficiency in long-range cortex-to-cortex communication
Angela Pretorius3y30

I still think that the dopamine system is involved in psychosis.

It is quite difficult for the brainstem to reward accurate perception. If dopamine production by the brainstem is in any way dependent on information that is coming in from the neocortex rather than from the brainstem’s own sensory areas then there is the potential for things to go wrong.

One part of the neocortex might get dopamine for detecting danger, and it can rewire itself to maximise its dopamine reward by hallucinating evil spirits.

Another part of the brain might get dopamine when social status increases, and it can rewire itself to maximise its dopamine reward by finding evidence that said individual is the messiah.

Another part of the brain might get dopamine whenever it comes across a really interesting hypothesis. Of course, the most interesting hypothesis is rarely the correct one.

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[Intro to brain-like-AGI safety] 13. Symbol grounding & human social instincts
Angela Pretorius3y20

When my little one was a newborn he was just as happy being handled by strangers as he was with mum and dad. It was around four months that he started showing a preference for mum and dad and disliking strangers. I’m sure that he could recognise us long before the four month mark though.

Geese need to imprint from birth, whereas there is no immediate need for a baby who is not yet mobile to imprint on it’s parents. So if babies have an ‘imprinting window’ then it probably occurs later, after a baby has learnt to reliably recognise familiar faces in spite of changes in make-up or clothing.

Aside: Babies prefer to look at faces while still in the womb https://www.lancaster.ac.uk/news/articles/2017/babies-preference-for-faces-begins-before-birth-/.

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[Intro to brain-like-AGI safety] 13. Symbol grounding & human social instincts
Angela Pretorius3y10

Mother geese don’t change their appearance much over their lifetime. I doubt that a chick ever needs to update its mommy thought assessor.

The ‘my kid’ thought assessor in humans is easily fooled by puppies and baby rabbits. Spend a large proportion of your waking hours around a cute animal and your brainstem assumes that it is your child.

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3Opinions on the sleep synaptic homeostasis hypothesis?
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10Did convalescent plasma therapy drive the evolution of more infectious covid strains?
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1Angela Pretorius's Shortform
5y
5