[Eeglablist] Question about EEG Power

Simon Finnigan finnigan.simon at gmail.com
Wed Aug 12 22:51:12 PDT 2015

Hi Carla

On face value, absolute power values as high as 400 μV2 may not necessarily
seem too unusual .... however based on my various experiences analysing EEG
power spectra - these are unusual (unless they are observed at the very
lowest frequencies, i.e. less than 0.5-1Hz). Generally speaking, power
values (across approx 1-30Hz, at least) shoudl generally be more in the
range of tens rather than hundreds (μV2).

[By the way - in general I think it's often preferable to analyse relative,
rather than absolute, band-power.]

You can feel free email me if you'd like further info.

Simon Finnigan

On Tue, Aug 11, 2015 at 1:19 AM, Carla Barros <carla.88.barros at gmail.com>

> Dear all,
> We have been trying to calculate total, evoked and induced power related
> to auditory processing in an oddball task.
> Power has been calculated as the squared magnitude of the EEG (μV2),
> followed by baseline correction, following Roach and Mathalon (2008) and
> others. However, the resulting values have been intriguing us, since they
> vary between 0 and 400 μV2. Based on the existing studies, it is difficult
> to get a sense of what should be the right range, since many do not report
> the measurement unit and others refer to power as μV and not as μV2.
> Based on your experience, what would be your recommendation for the
> baseline correction method (we are using the subtraction method)?
> Thank you very kindly in advance.
> Best regards,
> Carla Barros, MS.C., Biomedical Engineer
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