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Reviews (4)
05 September 2007
Emergence
The book lays out a series of examples of emergent events in the universe, from the big band and the creation of elements to the origins of life, multicellularity, nervous systems, minds, consciousness, societies. The writing is clear and accessible for all.
05 January 2008
Correlation theories of visual form
As far as I can see, there still does not exist a coherent and compelling neurocomputational theory of how we perceive visual form. Before vision science went down the dubious path of feature detectors and receptive fields, which attempt to build up the visual scene through local features (e.g. points, edges), there were Gestaltist and correlation-based models that emphasized relations between the parts that make up a form. Uttal's spatial autocorrelation model is a very imaginative approach to the representation of visual forms (what distinguishes a circle from a triangle from a square?) and textures. He tested his model using dotted forms, which are readily detectable, discriminable, and recognizable, but confound many schemes based on local features. Spatial autocorrelations computed at each retinal position are an alternative way of doing spatial Fourier analysis. Definitely not for the nontechnical reader, but quite relevant to those seeking alternative theories of vision.
06 April 2019
A Must-Read if you want to understand who TDonald Trump is.
This is must reading if you want to understand who Donald Trump is and where he came from.
I think Johnstone knows more about Trump and his dealings with other people and the government than perhaps any other person.
It's a fast read, but with plenty of sourcing and footnotes in the back.