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Aug 26 • 4 tweets • 2 min read
The apocalypse comes by driving us to perpetual mild amusement.
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More from @DrYohanJohn

Yohan John Profile picture
Aug 28
From "On the Meanings of the Logical Constants" by Per Martin-Löf. Image
"The proof of an axiom can only be intuitive, which is to say that an axiom has to be grasped immediately, in a single act."

Tempting to define philosophy as the practice of disagreeing about intuitions. 😛 Image
"to know that a proposition is true, a problem is solvable, an expectation is fulfillable, or an intention is realizable, you must know how to verify, solve, fulfill, or realize it, respectively." Image
Read 5 tweets
Yohan John Profile picture
Aug 28
"Mathematics is created by a free action independent of experience; it develops from a single aprioristic basic intuition [Ur-intuition], which may be called invariance in change as well as unity in multitude." - LEJ Brouwer Image
"... the notions of ‘invariance’ and ‘change’ are contradictory if we consider them separately. The same thing is true of the notions ‘unity’ and ‘multitude’. Thus it seems that according to Brouwer, we are able to intuit contradictory notions in a single action." Image
"..we cannot perceive any one of the pair continuity - discreteness without the other." Image
Read 4 tweets
Yohan John Profile picture
Aug 18
"By examining its current trajectory of development, we conclude that PP remains only loosely connected both to its computational framework and to its hypothetical biological underpinnings, which makes its fundamentals unclear."

pubmed.ncbi.nlm.nih.gov/32594580/
"there is a one-to-many mapping between the key technical PP term of precision (having strict computational sense) and the whole gamut of subjective phenomena."

Hedgehog theory is such a common danger.
Pretty good point, I think.

"proponents of PP-informed schizophrenia models do not specify how higherlevel cognitive beliefs could compensate for imprecise low-level priors."
Read 5 tweets
Yohan John Profile picture
Aug 17
"we suggested that the remarkable increase of the size of the human brain due to its prolonged prenatal development has brought with it an increased sparsification, hierarchical modularization, as well as increased depth and cytoarchitectonic differentiation of brain networks."
I was once told that humans have far more ability to independently control articulators, like when we waggle our fingers. Apparently chimpanzees cannot do this (but correct me if I'm wrong).

This ability seems like a microcosm of the sparsification mentioned above.

(...)
Another factor that may help is the relative increase in inhibitory interneurons in the human brain compared to other species. Computational models show that inhibition is a key tool to enable decorrelation, which we can think of as a flexible, context-sensitive sparsification.
Read 5 tweets
Yohan John Profile picture
May 16
Good article, but I am surprised that there is no mention of the fact that magenta clues us that the human visual system has created a form of topological closure (not implied by the 1d wavelength spectrum).

Magenta has no equivalent wavelength. It's "the absence of green".

👇 Image
If you are unfamiliar with this whole idea, I recommend watching this video:

Newton was well aware of the fascination phenomenon of "extraspectral hues".

This website has an excellent level of detail on the biology of color vision:

handprint.com/HP/WCL/color2.… Image
Read 4 tweets
Yohan John Profile picture
Apr 13
Why I am not in the 'Bayesian Brain' camp, exhibit A.

"...Bayesian models are significantly unconstrained, both because they are uninformed by a wide range of process-level data and because their assumptions about the environment are generally not grounded in [...] measurement." Image
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"Rational approaches attempt to explain why cognition produces the patterns of behavior that is does, but they offer no insight into how cognition is carried out." Image
Read 20 tweets

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