Eye chart number). The denominator indicates the distance in feet at which a person with normal vision could stand to correctly identify the same symbols identified by the person tested. For example, a visual acuity of 20/20 is considered normal. Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision. There is often also a need to test a subject's vision at near or occupational tasks (such as reading or computer use). For these situations, a Rosenbaum
Name-letter effect to rank the English alphabet by the pleasantness of the appearance of capital letters. While there was not a great deal of agreement amongst the subjects (the coefficients of concordance were low), a strong positive correlation was found between a letter's average rank and how frequently it occurred as an initial letter of family names. Robert Zajonc, a social psychologist, published research in 1968 into preferences between pairs of words (e.g. "on" or "off"): in the overwhelming majority of trials the preferred word was also the most common. Zajonc also tested preferences for nonsense words and found that people liked