William Kessen

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Two studies examined the organization of color perception in 4-month-old human infants. In Study 1, infants looked at selected spectral stimuli repeatedly until their visual attention waned. The stimuli represented instances of basic adult hue categories - blue, green, yellow, and red. Following habituation, infants were shown a series of wavelengths which(More)
OBJECTIVE To test the hypothesis that the appropriateness of parents' use of early follow-up care after emergency department (ED) visits can be improved by postvisit support from a nurse practitioner. DESIGN Randomized controlled trial, single blinded. SETTING Urban university hospital ED linked to hospital's primary care center. PARTICIPANTS Parents(More)
To study and predict a set of screening decisions in a medical school admission process, a stratified sample (n = 864) was drawn to represent the range of applicants to the Yale University School of Medicine during a single year. A smaller sample from the following year's applicants was drawn in a similar fashion for purposes of cross-validation. Prior to(More)