A spatial approach of magnitude-squared coherence applied to selective attention detection

• Autor(a) principal: Felix, Leonardo Bonato
• Data de Publicação: 2014
• Outros Autores: Ranaudo, Fernando de Souza, D’affonseca Netto, Aluizio, Sá, Antonio Mauricio Ferreira Leite Miranda de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: https://doi.org/10.1016/j.jneumeth.2014.03.014; http://www.locus.ufv.br/handle/123456789/18573
• topic: Selective attention; Spatial Coherence; Auditory steady-state response

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.