Epstein's phrenoblysis hypothesis states that brain growth and mental growth occur in correlated spurts at 3-10 months and 2-4, 6-8, 10-12 or 13, and 14-16 or 17 years of age. The present study was the first to test statistically such spurts in head-circumference and mental-age growth rates and to assess any correspondence in individual differences between spurts in the two variables in a single sample of children measured serially between 2.5 and 17 years of age. While the statistically significant spurts observed in each variable did fall within the hypothesized age periods, the chance rate for such theoretical concordance was high and several hypothesized spurts were not supported. Moreover, no relationship existed within individuals between head-circumference and mental-age growth-rate patterns.
The impact of USA Today on 18-to-35-year-old readers was measured to determine if younger audience members used this paper differently than they use other dailies. The investigation included whether USA Today has had an effect on younger readers' use of other newspapers. Results suggest USA Today's approach represents the best known hope in the newspaper industry for reversing the decline in young-adult readers, and the best known way for rival editors to protect against encroachment by USA Today.
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