To establish the spatial generality of perseverative errors in infant manual search, a group of infants aged 8-11 months performed Piaget's Stage IV task with an object hidden at successive locations in the vertical plane. (Author/JMB)

Examined 3- and 4-year-olds with regard to their abilities in recognizing differences between certain speech sounds and their performance in imitating and spontaneously generating the same sounds in familiar words. Results are related to a theory of phonemic development in children. (Author/SDH)