Humphreys's attenuated test of Spearman's hypothesis

Humphreys's test of Spearman's hypothesis (viz., that the size of the standardized black-white differences on various psychometric tests is positively related to the tests' loadings on g, the general intelligence factor) is methodologically weak. It is based on comparison of a fairly representative sample of the black population of U.S. school children with a highly selected sample of the white school population, representing the lowest 15 to 20% of whites in socio-economic status (SES). A fair test of the hypothesis requires that the black and white samples should not be selected on any g-correlated variable, such as SES. Selection attenuates and distorts the relationship between tests' g loadings and the magnitude of the standardized mean black-white differences on the tests. Other unorthodox conditions in Humphreys's study, such as performing factor analysis on the test-score means of various arbitrary demographic groups instead of on individual test scores inflates tests' g loadings and biases the test of Spearman's hypothesis by restriction of reliable variance in g loadings. Humphreys's study cannot be considered a proper replication of Jensen's examination of Spearman's hypothesis in 11 different studies comprising 74 different tests, which consistently bears out Spearman's hypothesis.     

Entertaining Each Other?

Television (TV) is reemerging as a focal point for common experiences and community formation through the use of various digital technologies while viewing. A prominent example of this is second screening, or the use of various technologies to share reactions to and attitudes and opinions about what we see and hear while watching TV with other (virtual) viewers. We contend that second screening requires communication scholars to rethink the nature of the TV entertainment experience, as the practice increasingly blurs lines between interpersonal and mass communication processes. In this article, we introduce a conceptual model designed to identify key issues to be considered and addressed by those seeking to better understand entertainment experiences during socially shared TV viewing.