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Evoked potentials (EP) (a.k.a. Event related potentials, ERP)

Evoked potentials (EP) (a.k.a. Event related potentials, ERP). Raw signal is “noisy” so we reduce noise by repeating stimulus and averaging potentials A time domain analysis. Time-locked presentations, repeated with EEG. EPs to test sensory pathway integrity.

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Evoked potentials (EP) (a.k.a. Event related potentials, ERP)

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  1. Evoked potentials (EP)(a.k.a. Event related potentials, ERP) • Raw signal is “noisy” so we reduce noise by repeating stimulus and averaging potentials • A time domain analysis

  2. Time-locked presentations, repeated with EEG

  3. EPs to test sensory pathway integrity

  4. Letter = Positive or negative deflectionNumber = milliseconds (or 100s ms) • Examples • P300 can occur between 300-800 ms • N400 may occur prior to it. task deviant stimuli

  5. Presentations and Responses • Oddball

  6. Oddball paradigm • We habituate to regular stimulation • Any sound, image, pattern • Oddball is the rare event A A A A C A A [odd=C] CCCA CCC [odd=A]

  7. Positive deflections • P300 • Negative deflections • N100 • N400

  8. Atypical housing of language functions in autism

  9. ERP reveals age, diagnoses

  10. Kayser et al, in press

  11. ERD – Event related desynchronization(frequencies may tell us more about mental operations)

  12. CSA – compressed spectral array

  13. Time domain (ERP)vs Frequency domain (ERD) task deviant stimuli

  14. Fewer trials needed than ERP

  15. Assess extent of info processing

  16. Diagnosing with ERD

  17. Effect of sleep deprivation

  18. Different neurophysiological operations reflected in different rhythms (thalamocortical, intracortical)

  19. Topography reveals specific de/activation patterns

  20. Leveraging functional laterality

  21. ERD & PRS

  22. Lie detection

  23. Neuroimaging of Lie detection

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