Many people have argued that natural categories are organized in terms of a family resemblance principle. Members of family resemblance categories tend to share properties with each other but have no properties that are singly necessary and jointly sufftcient (defining) for category membership. This paper reports seven experiments using a sorting task to evaluate the conditions under which peop...

Father-child resemblance is increasingly attracting attention from researchers interested in studying paternal investment. The current study sought to determine whether a quasi-experimental infant massage intervention would increase father's perceptions of resemblance. The study included a dozen fathers in each of two groups: the first received an intensive series of lessons on infant-father ma...

purpose: to report a relatively rare case of familial exudative vitreoretinopathy (fevr). patient and findings: a 13-year-old boy referred with decreased visual acuity of both eyes, specially right eye from 6 years ago. he had several ophthalmologist and optometrist visits and spectacle prescription without any improvement of vision. best corrected visual acuity (bcva) was 25 cm of count finger...

The comparative study of proteins is being used with greater frequency to produce information concerning genetic differences among species. Such studies make it increasingly evident that there may not be a strict correlation between degree of genetic difference and degree of difference at the supramolecular or organismal level. This point can be illustrated by the results of comparing proteins ...