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Counting
Counting is the action of finding the number of elements of a finite set of objects. The traditional way of counting consists of continually increasing a (mental or spoken) counter by a unit for every element of the set, in some order, while marking (or displacing) those elements to avoid visiting the same element more than once, until no unmarked elements are left; if the counter was set to one after the first object, the value after visiting the final object gives the desired number of elements. The related term enumeration refers to uniquely identifying the elements of a finite (combinatori
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Details aside, the frequency-of-seeing experiment brings forward a beautiful idea: the probabilistic nature of our perceptions reflects the physics of random photon arrivals. An absolutely crucial point is that Hecht, Shlaer, and Pirenne chose stimulus conditions such that the five to seven photons needed for seeing were distributed across a broad area on the retina, an area that contains hundreds of photoreceptor cells. Thus, the probability of one receptor (rod) cell receiving more than one ph
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― Biophysics: Searching for Principles
― Biophysics: Searching for Principles
