STUDIES OF DISPLAY SYMBOL LEGIBILITY. PART V. THE EFFECTS OF TELEVISION TRANSMISSION ON THE LEGIBILITY OF COMMON FIVE-LETTER WORDS
MITRE CORP BEDFORD MA
Pagination or Media Count:
The legibility of common five-letter words was studied under four conditions with solid-stroke letters, and with 10.7, and 5 horizontal scan lines per character height on a television monitor. Twelve subjects were shown 100 words, one at a time, under controlled conditions. The subjects task was to recite each word as quickly and as accurately as possible. Analysis of the errors and reaction times showed that the legibility of the words significantly decreased as the number of lines decreased. Using the mean reaction time of the solid condition as a base, there is a 32-percent increase in mean reaction time for the 10-line television presentation, 40 percent using 7 lines and 89 percent using 5 lines.
- Anatomy and Physiology
- Non-Radio Communications