LIGN 170 Lecture Notes - Lecture 4: N400 (Neuroscience), Dyslexia, Categorical Perception

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7 Feb 2017
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Language and the Brain
- Topics you need to know
Disorders
Williams syndrome and SLI
Dyslexia
Localization in the brain
Lateralization experiments
Old school neuro: Wernicke’s and Broca’s areas
Issues with current theories
Measuring language processing
ERP
- Languages in real time: ERPs
Measures the change in electric voltage over large numbers of neurons lined up
with a number of stimuli
Not single cell recording
Replicable ERP effects
N400
P600
Components
Less invasive
Less time delay
fMRI has a time delay
- N400 vs. P600
Both are always observed
N400
Semantic observation
Example: “whipped cream tastes anxious” will generate a large N400
Unpredictable anomalies and low frequency (uncommon) words
P600
Syntactic observation
Ungrammatical sentences and when something doesn’t fit properly will
generate a large P600
Example: “the spoiled child throw the toy on the ground”
Example: “do a shower”
Occurs when trying to recover what the person was trying to
say
They are proof of top-down processing
They suggest predictions are being made
Context -> hypothesis -> predictions -> integration
- Practice Eliciting ERPs
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