Deb roy - experiment cla. on average.

DEB ROY (Most modern child language acquisition reseach) Horizon - why do we talk? Language - defines us, distinquishes us, how we learn to talk remains a mystery. Experiment - filmed his first child 24/7 learning to speak from moment born until 3 years old. 'speech home project' Babbling...single words... two word stage... complex. Trait of parent = unconsciously simplified speech Parent mirrors childs development cooing and babbling is essential to language development children understand more than they can say On average; children know 5000 words by the age of 5. They learn 3000 new words a year from there. Adults speak roughly 5000 words per day.