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000000309 001__ 309
000000309 037__ $$aENY-ARTICLE-2009-248
000000309 041__ $$aeng
000000309 088__ $$aAZ I07/2005/I-002
000000309 100__ $$aLeonowicz, Z$$uWroclaw University of Technology, Poland
000000309 245__ $$aTrimmed estimators for robust averaging of event-related potentials
000000309 260__ $$c2005-01-18
000000309 300__ $$a10p
000000309 500__ $$aJournal of Neuroscience Methods, 2005, vol. 142, No. 1, pp. 17-26.
000000309 520__ $$aAveraging (in statistical terms, estimation of the location of data) is one of the most commonly used procedures in neuroscience and the basic procedure for obtaining event-related potentials (ERP). Only the arithmetic mean is routinely used in the current practice of ERP research, though its sensitivity to outliers is well- known. Weighted averaging is sometimes used as a more robust procedure, however, it can be not sufficiently appropriate when the signal is nonstationary within a trial. Trimmed estimators provide an alternative way to average data. In this paper, a number of such location estimators (trimmed mean, Winsorized mean and recently introduced trimmed L{mean) are reviewed, as well as arithmetic mean and median. A new robust location estimator tanh, which allows the data{dependent optimization, is proposed for averaging of small number of trials. The possibilities to improve signal-to-noise ratio (SNR) of averaged waveforms using trimmed location estimators are demonstrated for epochs randomly drawn from a set of real auditory evoked potential data.
000000309 6531_ $$aaveraging
000000309 6531_ $$aevent-related potentials
000000309 6531_ $$aevoked potentials
000000309 6531_ $$amean
000000309 6531_ $$amedian
000000309 6531_ $$atrimmed mean
000000309 6531_ $$arobust estimators of location
000000309 6531_ $$atrimmed estimators
000000309 700__ $$aKarvanen, J$$uHelsinki University of Technology, Finland
000000309 700__ $$aShishkin, S L$$uLomonosov State University, Russia
000000309 8560_ $$fleon99@pwr.wroc.pl
000000309 8564_ $$uhttp://zet10.ipee.pwr.wroc.pl/record/309/files/$$zAccess to Fulltext
000000309 909CO $$ooai:zet10.pwr.wroc.pl:309$$pglobal
000000309 980__ $$aARTICLE