LING 200 Lecture Notes - Lecture 16: N400 (Neuroscience), Aphasia, Neurotypical
24 Dec 2018
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Key ideas from lecture 15: language is lateralized, largely associated with the left hemisphere of the brain, evidence from location of broca"s and wernicke"s areas. Wernicke"s area = speech comprehension: evidence from dichotic listening, language is modular, largely independent from other cognitive systems with which it interacts, evidence from aphasia, evidence from erp. N400 component: first language-related erp component to be identified, negative voltage peaks around 400 milliseconds after the stimulus is presented, associated with the lexical-semantic processes (word meaning, greater n400 voltage associated with lexical-semantic anomaly in the stimulus. Erp signals: solid lines = response to semantically normal sentence, the boat sailed down the river and sank, dashed lines = response to semantically anomalous sentence, the boat sailed down the river and ate. Specific types of brain activity are tied to specific types of language processing. Typical errors of english speakers with sli: dropping the -s off present tense verbs.
