TLDR: argument via XKCD :-)
Part of the author's argument is simply that TV causes people to become mentally passive (alpha-wave brain states, etc) but another aspect of the argument is what kind of content optimizes impact given the medium. He argues that TV works differently even from movies in part because TV simply has such low resolution and so it mostly shows close ups of faces experiencing extreme emotions, slow motion replay of human bodies colliding, and dancing cartoon squirrels because those are what the medium does best.
A movie can give you a landscape or other complex scene and have it mean something. A book can cover nearly anything (including mental states), but only via low bitrate descriptive text, generally delivering a linearized stream of implicitly tree structured arguments or a narrative.
When choosing a publication venue, the form of the media determines the competitive environment and the safely assumed cognitive skills of the audience. There may be outliers like UCTV, but the central tendency reveals the medium's strengths.
The place to look to test the author's thesis (as opposed to the derivative claim about the value of video for this community) would be to compare the memetic complexity, themes, and "rationality" in top youtube videos, versus highest grossing movies, versus best sellers.
I could easily imagine that it could be helpful for aspiring rationalists to express themselves and argue in more than one medium simultaneously so that their ideas have to survive in multiple contexts that should not theoretically change the "reality correspondence" of their thinking...
And good uses for low res video could probably be found by anyone trying to consciously game the medium in light of analysis of the medium...
...but "in general, for society, as a medium" I would guess that low res video isn't particularly conducive to rationality.
I agree about the general low quality of youtube comments, but occasionally I'll see a special interest video with intelligent comments. The low quality may be a result of youtube being popular with the general public (blogs have specific audiences, youtube is for everyone) combined with founder effect, so that people who want to do intelligent comments generally put them elsewhere.
It seems to me that another test case is audio books vs books in text.
I'd rather see tests of how well people take in argument offered in text vs sound, and some attention to whether there are different subgroups.
[...] SIAI's Scary Idea goes way beyond the mere statement that there are risks as well as benefits associated with advanced AGI, and that AGI is a potential existential risk.
[...] Although an intense interest in rationalism is one of the hallmarks of the SIAI community, still I have not yet seen a clear logical argument for the Scary Idea laid out anywhere. (If I'm wrong, please send me the link, and I'll revise this post accordingly. Be aware that I've already at least skimmed everything Eliezer Yudkowsky has written on related topics.)
So if one wants a clear argument for the Scary Idea, one basically has to construct it oneself.
[...] If you put the above points all together, you come up with a heuristic argument for the Scary Idea. Roughly, the argument goes something like: If someone builds an advanced AGI without a provably Friendly architecture, probably it will have a hard takeoff, and then probably this will lead to a superhuman AGI system with an architecture drawn from the vast majority of mind-architectures that are not sufficiently harmonious with the complex, fragile human value system to make humans happy and keep humans around.
The line of argument makes sense, if you accept the premises.
But, I don't.
Ben Goertzel: The Singularity Institute's Scary Idea (and Why I Don't Buy It), October 29 2010. Thanks to XiXiDu for the pointer.