Format: HTML | BibTeX | DC | EndNote | NLM | MARC | MARCXML
Preprint / ENY-PREPRINT-2008-001

Optimized robust averaging of event-related potentials

Leonowicz, Z (Laboratory for Advanced Brain Signal Processing, Brain Science Institute, RIKEN, Japan) ; Karvanen, J (Laboratory for Advanced Brain Signal Processing, Brain Science Institute, RIKEN, Japan) ; Shishkin, S (Laboratory for Advanced Brain Signal Processing, Brain Science Institute, RIKEN, Japan)

2004-03-17

Abstract: Averaging is one of the most commonly used procedures in Neuroscience and is the basic procedure for obtaining event-related potentials (ERP). Averaging or the estimation of the location of data can be done in different ways, although only the arithmetic mean is routinely used in the current practice of ERP research. In this paper, a number of location estimators (mean, median, trimmed mean, Winsorised mean and recently introduced trimmed L-mean) are reviewed. A new robust location estimator tanh, which allows the data-dependent optimization, is proposed for averaging of small number of trials. The performance of the location estimators, expressed by the signal-to-noise ratio (SNR) of averaged waveforms, is compared for different number of epochs randomly drawn from a set of real auditory evoked potential (EP) data. Procedure of multi-averaging is developed to optimize the choice of the location estimator with respect to SNR or other criterion of the performance. Experiments with real auditory EPs demonstrate significant achievable gain compared to the mean averaging. The procedure of multi-averaging can be applied to a wide range of experimental data, when an objective criterion of the quality of the averaged data can be calculated.

Keyword(s): event-related potentials ; ERP ; averaging ; optimization ; robust estimators of location ; mean ; median ; trimmed mean ; Winsorised mean ; trimmed L-mean ; signal-to-noise ratio ; SNR ; tanh estimator ; multi-averaging
Note: Preprint submitted to Journal of Neuroscience Methods 17 March 2004


Fulltext : http://zet10.ipee.pwr.wroc.pl/record/27/files/

Cited by: try citation search for ENY-PREPRINT-2008-001

Rekord stworzony 2008-03-07, ostatnia modyfikacja 2008-04-20

Podobne rekordy


 
Osoby, które oglądały tę stronę, oglądały również:
(1010)  Impact of Distributed Generation on Electrical Power Network - Khan, U N - ENY-ARTICLE-2008-142
(999)  Adaptacyjne sieci neuronowe w zastosowaniu do identyfikacji stanu układów elektrycznych - Kostyla, P - ENY-THESIS-2008-005
(994)  Proceedings of the Int. Conference "7th EEEIC International Workshop on Environment and Electrical Engineering" - Schwarz, H et al - ENY-PREPRINT-2008-008
(992)  Evaluation of compensation devices of DC arc furnaces using advanced spectrum estimation methods - Bracale, A et al - ENY-ARTICLE-2008-011
(992)  Parametric methods for time-frequency analysis of electric signals - Leonowicz, Z - ENY-BOOK-2008-001

 
Oceń ten dokument:
Bądź pierwszy i oceń ten dokument.


Dyskusja nad tym dokumentem:
Rozpocznij dyskusję o tym dokumencie.