[Eeglablist] Question about EEG Power

[Makoto Miyakoshi]

Dear Carla,

> Based on your experience, what would be your recommendation for the
baseline correction method (we are using the subtraction method)?

When we analyze ERSP (i.e., trial-averaged wavelet transform), we convert
all the values into dB (20*10logX) and subtract the mean across baseline
period from all datapoints.

> it is difficult to get a sense of what should be the right range

That's an interesting point. I don't see raw values for power.

Makoto

On Mon, Aug 10, 2015 at 8:19 AM, Carla Barros <carla.88.barros at gmail.com>
wrote:

> 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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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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