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"The use of a one-- or two--line inclination code has been found, in previous experiments conducted under this contract, to be an effective method for encoding from 10 to about 32 possible categories of information. For some purposes, however, a much larger alphabet of symbols is required. This study was a preliminary investigation of the psychological feasibility of employing coding schemes based on complex line--inclination symbols for encoding information, such as elevation, that may require as many as 50 unique symbol categories. Four groups of 20 subjects each decoded elevation information that had been encoded by the use of four different coding ensembles. Each group worked with a different one of the four codes. The four ensembles were called the binary, the decimal, the wheel, and the clock codes. The first three of these were based on the same type of stimulus symbol (eight lines radiating at 45--degree angular separations from a central hub), whereas the clock code was based on a stimulus symbol consisting of a circle and two lines each of which could be discretely positioned to correspond to the hour positions of a clock. The decimal and clock codes were decoded with gre

Author

Learner, David B.,

Publisher

Wright Air Development Center, Air Research and Development Command, United States Air Force, 1956.

Published

1956

Language

EN