Abilities of 2-, 5-, and 7-year-old children to interpret, judge acceptability of, and produce class extensions were assessed. It was concluded that increasing ability to deal appropriately with class extensions is primarily due to general advances in language acquisition rather than to any development unique to the class-extension word-formation…

Examines alert newborn and five-month-old infants' responsivity to variations in spectral composition of a rattle sound. Head orientation and cardiac responses to sound were recorded. Heart rate change did not vary as a function of frequency at either age, suggesting that all stimuli were equally effective in eliciting the infant's attention.…

This study compared speech and language comprehension and production between 249 very low birthweight and 363 normal birthweight 8 year olds. Although low birthweight children tended to score lower, when those with major neurological abnormalities were excluded, no significant differences were found between the two groups. However, general…