The document discusses child language development and disorders. It covers topics like: - Language milestones from birth to adolescence - Evidence that the left hemisphere becomes specialized for language between ages 3-10 - Effects of left hemisphere brain injuries at different ages - Genetic factors in language development and specific language impairment - Theories of language evolution in humans and other primates

1. Child aphasia & other disorders Brain & Language LING 411, NSCI 411/611 Harry Howard Tulane University

2. Come See a Movie With Thursday October 12 7:00 pm in Paterson Lounge Neuroscience Majors Psych Majors TUNA Members Cell Majors The Tulane University Neuroscience Association is hosting a showing of the film The Jacket . Come enjoy some food with us while we watch.

3. Q2 answers

5. Normal language development L2 is increasingly difficult 15y + foreign accent in L2 11-14y grammatical refinement & expansion of vocabulary of L1/L2 3-10y acquisition of structure of L1/L2 21-36m from babbling to words in L1/L2 4-20m cooing 0-3m Language milestone Age

9. Effect of LH lesion at age aphasiac symptoms persist (usually irreversible if more than 3-5m) 15y + aphasiac symptoms no longer recovered from fully 11-14y aphasiac symptoms but with full recovery 3-10y L1 lost, reacquired with repetition of all stages 21-36m “ 4-20m 50% no effect, 50% delayed onset of language but normal development 0-3m Effect of LH lesion Age

10. Conclusions LH dominant in 97% population 15y + LH becomes dominant (invariance) 11-14y LH takes over more responsibility, but language can still be re-established in RH if LH is damaged 3-10y LH begins to assume responsibility 21-36m “ 4-20m no lateralization of language (equipotentiality) 0-3m Organization of hemispheres Age