Comparison Of Four Methods Of Encoding Elevation Information With Complex Line Inclination Symbols

Author : David B. Learner
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.3/5 (91 download)

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Download or read book Comparison of Four Methods of Encoding Elevation Information with Complex Line-inclination Symbols written by David B. Learner and published by . This book was released on 1957 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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 greater speed than the wheel and binary codes. The wheel code was inferior to the other three codes with regard to accuracy. These data are regarded as another demonstration of S-R compatibility effects, and of the importance of considering both the alphabet and the readout in selecting an S-R ensemble for encoding any specific type of information. The present results were obtained with subjects who had undergone less than one hour of practice in reading the specific code used by their group, but with displays that were oriented in fixed positions relative to the subjects. Although the two best of the four codes employed should undergo further study before being used for encoding elevation information, the data of this study indicate that they are psychologically feasible for such use."--Abstract