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CONTEXT Although there is now considerable evidence that genetic effects play a critical role in the development of alcohol dependence (AD), theoretical and methodological limitations of this literature require caution in describing the etiology and development of this disorder. OBJECTIVE To disentangle genetic and environmental effects on AD by means of(More)
Two new experiments and a reanalysis of Toye's (1986) data are used to examine the relationship between true distance and perceived distance in natural scenes. In the first experiment, 8 subjects estimated 78 interobject distances, formed by all pairs of 13 objects, while viewing the objects from a fixed position. The results showed that estimated distance(More)
Nine methods of indicating the direction to object locations were tested on twenty blind adult subjects. The task was to indicate the location of active auditory targets distributed in a semicircle with a 1.7 m radius around the subject. Target location, practice, and feedback were systematically varied for each method. The greatest accuracy and lowest(More)
To demonstrate an interfering effect of subvocal articulation on otherwise silent reading, college-student subjects were asked to repeatedly read, either silently or aloud, both tongue-twister sentences and control sentences matched for syntactic complexity, syllable count, and sentential stress pattern. A technique was developed to measure the amount of(More)
Research on distance perception has focused on environmental sources of information, which have been well documented; in contrast, size perception research has focused on familiarity or has relied on distance information. An analysis of these two parallel bodies of work reveals their lack of equivalence. Furthermore, definitions of familiarity need(More)