Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/18573
Tipo: Artigo
Título: A spatial approach of magnitude-squared coherence applied to selective attention detection
Autor(es): Felix, Leonardo Bonato
Ranaudo, Fernando de Souza
D’affonseca Netto, Aluizio
Sá, Antonio Mauricio Ferreira Leite Miranda de
Abstract: Auditory selective attention is the human ability of actively focusing in a certain sound stimulus while avoiding all other ones. This ability can be used, for example, in behavioral studies and brain-machine interface. In this work we developed an objective method – called Spatial Coherence – to detect the side where a subject is focusing attention to. This method takes into consideration the Magnitude Squared Coherence and the topographic distribution of responses among electroencephalogram electrodes. The individuals were stimulated with amplitude-modulated tones binaurally and were oriented to focus attention to only one of the stimuli. The results indicate a contralateral modulation of ASSR in the attention condition and are in agreement with prior studies. Furthermore, the best combination of electrodes led to a hit rate of 82% for 5.03 commands per minute. Using a similar paradigm, in a recent work, a maximum hit rate of 84.33% was achieved, but with a greater a classification time (20 s, i.e. 3 commands per minute). It seems that Spatial Coherence is a useful technique for detecting focus of auditory selective attention.
Palavras-chave: Selective attention
Spatial Coherence
Auditory steady-state response
Editor: Journal of Neuroscience Methods
Tipo de Acesso: Elsevier B.V. All rights reserved.
URI: https://doi.org/10.1016/j.jneumeth.2014.03.014
http://www.locus.ufv.br/handle/123456789/18573
Data do documento: 26-Mar-2014
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