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Spikes analysis in EEG and MEG

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Spikes analysis in EEG and MEG

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    1. Spikes analysis in EEG and MEG jfernan@det.ua.pt IEETA/DETI@UA

    2. Spikes in EEG and MEG Question Are EEG spikes equal to those found in MEG? Methods Measure the “shapes” Normalized with background activity Selected Spikes Occurring in both EEG and MEG Occurring at same time (+/- 35 ms) Compare measures

    3. Spike model: Measures Duration (Dur) PP1/PP2 Sharpness (C)

    4. They are statistically different

    5. EEG and MEG spikes Don’t trust the looks They are different MEG spike is “smaller” Shorter (take less time)

    6. MEG spike is shorter than EEG Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    7. MEG spike is “smaller” Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    8. MEG spike is “smaller” Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    9. MEG spike is shorter Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    10. MEG spike is shorter Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    11. MEG spike is shorter Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    12. MEG spike is shorter Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    13. EEG and MEG spikes Don’t trust the looks They are different MEG spike is “smaller” (shrink) Shorter (take less time)

    14. Conclusions Results imply that the processes of visual inspection of MEG spikes and automatic spike detector algorithms should be modified in relation to those used in EEG.

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