[Eeglablist] Number of samples
Robertson, Caroline
carobertson at csu.edu.au
Mon May 26 22:17:44 PDT 2014
Hi all,
I am currently examining the EEG response to certain exercise bouts. We only have a 256Hz system and are currently using 30sec data sample window. As you discuss below this may not improve the information because of the variability of the signal... on top of which exercise clearly adds to the level of noise... I have only read in one paper that the minimal suggested sample window during exercise is 20secs of data but does anyone have any other suggestions?
Many thanks
Caroline
From: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Pål Gunnar Larsson
Sent: Thursday, 22 May 2014 4:33 PM
To: 'Samaneh Valipour'; mmiyakoshi
Cc: eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] Number of samples
Remember that EEG is a very dynamic signal. Hence, longer samples is not expected to give better information as the signal changes within the sample window. However, increasing the sampling rate, increases the information. According to Nyquist you will be able to reconstruct a signal if you sample faster than the double of the highest frequency in the signal. However, that is when the signal is stable (EEG is not) and the sample is infinite long. Practically you will often end up sampling 5-10 time the highest frequency in biological signals.
Pål G. Larsson M.D., PhD.
Head of Clinical Neurophysiology
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Dr. philos. Pål G. Larsson
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Fra: eeglablist-bounces at sccn.ucsd.edu<mailto:eeglablist-bounces at sccn.ucsd.edu> [mailto:eeglablist-bounces at sccn.ucsd.edu] På vegne av Samaneh Valipour
Sendt: 21. mai 2014 06:58
Til: mmiyakoshi
Kopi: eeglablist at sccn.ucsd.edu<mailto:eeglablist at sccn.ucsd.edu>
Emne: Re: [Eeglablist] Number of samples
Thanks a lot Dear Makoto.
On Tue, May 20, 2014 at 10:03 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu<mailto:mmiyakoshi at ucsd.edu>> wrote:
Dear Samaneh,
Samples you mean sampling points? Yes of course. The more sampling points you have, the better (i.e. smoother and more reliable) the results are.
Makoto
2014-05-19 21:31 GMT-07:00 Samaneh Valipour <samanehvalipour61 at gmail.com<mailto:samanehvalipour61 at gmail.com>>:
Dear EEGLAB users,
I would like to be sure,whether the results of analysis of EEG using FFT or DWT depend on the number of samples?If is so, what is best choice for number of samples?
--
With very kind regards,
Samaneh .Valipour
PhD research student: DOES_UOP_INDIA
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--
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
--
With very kind regards,
Samaneh .Valipour
PhD research student: DOES_UOP_INDIA
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