[Eeglablist] Power Spectrum vs. Power Spectral Density

[Ayda Ghahremani]

Hi all,

Regarding your question, I think power spectral density is normalized and
is expressed in units per Hz. But, power spectra are not normalized.

Ayda


On Tue, Jun 3, 2014 at 3:28 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> Dear Brian,
>
> Actualy I did not know the difference. According to wikipedia, spectral
> density is something like spectra represented as cumulative distribution
> function.
>
> http://en.wikipedia.org/wiki/Spectral_density
>
> I don't know though when it is more appropriate to use power spectra and
> spectral density... someone in the list please help us.
>
> Makoto
>
>
> On Wed, May 28, 2014 at 8:50 AM, Erickson <ericksonb.eng at gmail.com> wrote:
>
>> List,
>> The function "spectopo" produces output in units of 10log_10 (uV^2/Hz).
>> This is power spectral density, as opposed to a power spectrum. Could
>> anyone comment on the implications of interpreting, physiologically, the PS
>> vs. the PSD of a neural signal? Thank you,
>>
>> - Brian
>> Applied Brain and Cognitive Sciences Program
>> Drexel University
>>
>> _______________________________________________
>> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>> To unsubscribe, send an empty email to
>> eeglablist-unsubscribe at sccn.ucsd.edu
>> For digest mode, send an email with the subject "set digest mime" to
>> eeglablist-request at sccn.ucsd.edu
>>
>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to
> eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20140603/a70b53ac/attachment.html>