Many Mental Processes Admit Of Being Roughly Measured.

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Many mental processes admit of being roughly measured. For instance, the
degree to which people are bored, by counting the number of their fidgets.
I not infrequently tried this method at the meetings of the Royal
Geographical Society, for even there dull memoirs are occasionally read.
[...] The use of a watch attracts attention, so I reckon time by the number
of my breathings, of which there are 15 in a minute. They are not counted
mentally, but are punctuated by pressing with 15 fingers successively. The
counting is reserved for the fidgets. These observations should be confined
to persons of middle age. Children are rarely still, while elderly
philosophers will sometimes remain rigid for minutes altogether.
-- Francis Galton (1909)

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