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18 Cards in this Set
- Front
- Back
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Purpose of ERP |
Record time-course of some cognitive function |
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The desired fluctuations are hard to distinguish from random fluctionations. This problem is overcome by |
taking repeated recordings to the same event and taking an average of the EEG response for the event of interest to give event related potentials |
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Potentials |
neural activity detected as electrical charges recorder from the scalp |
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ERP can be used with standard experimental designs, unlike |
fMRI |
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Pyramidal cells line up perpendicular to |
the cortical surface and when a group of them are activated together, the electrical fields add together |
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Orientation of field is |
perpendicular to the cortical surface |
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curvature of cortex affects |
where the field will emerge, this leads to poor spatial resolution of dipoles |
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64 electrodes |
is typical |
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The electrodes are: |
frontal, central, temporal, parietal and occipital and left hemi., midline and right hemi. |
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Electrode placed by the eye to |
directly record eye movement occurrences (Vertical Electro-Oculogram) |
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An epoch |
conditions are placed in 'epochs' |
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Averaging the ERPs |
boosts the signal and cancels the noise |
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Track brain activity to the |
1ms precision level |
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ERP measures ___________ processing |
endogenous can be tracked even when participants don't make an overt response |
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N170 |
faces |
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N400 |
typically seen in response to violations of semantic expectations - reflects interaction of semantic memory and language during sentence comprehension |
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The forward problem |
it is trivial to be given the location and orientation of a set of dipoles and to provide the expected distribution of voltage across the scalp |
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The inverse problem |
provided with a distribution of voltage across the scalp, it is impossible to know with certainty the location and orientation of the generating dipoles |
