The purpose of this study was to determine the functions relating size, blur, and contrast, and their interactions, to legibility of alpha-numeric symbols on a radar-type display.nTwelve subjects served under all 64 conditions obtained by combining factorially four levels of each of three variables: size, blur, and contrast. The stimuli, 36 alpha-numeric symbols, were projected on a ground-glass screen one at a time at a rate controlled by the subject's verbal responses. Instructions stressed equally speed and accuracy. Performance indices were information trans¬mitted, speed, and accuracy. Confusion data were also reported for specific conditions.
展开▼
