LIGN 170 Lecture Notes - Lecture 4: N400 (Neuroscience), Dyslexia, Categorical Perception
7 Feb 2017
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Old school neuro: wernicke"s and broca"s areas. Measures the change in electric voltage over large numbers of neurons lined up with a number of stimuli. Example: whipped cream tastes anxious will generate a large n400. Unpredictable anomalies and low frequency (uncommon) words. Ungrammatical sentences and when something doesn"t fit properly will generate a large p600. Example: the spoiled child throw the toy on the ground . Occurs when trying to recover what the person was trying to say. Context -> hypothesis -> predictions -> integration. Example: in german, chin/gin sound the same. The problem of continuous input and categorical perception. Can be observed with the head-turning paradigm. The probability of hearing one sound giver another. Example: pre never comes at the end. Example: ft never comes at the beginning. When speech sounds occur in mutually exclusive contexts. Example: pot and spot (aspirated and not aspirated) Example lid & lit ( i is longer in the first word)
