Abstract
AIMS. This work aims at beat-based entrainment mechanisms in the human brain. It examines the effect of rhythmic regularity on beta-band activity in the electroencephalogram (EEG). Motivated by previous demonstrations of beta power modulation by a regular beat (Fujioka et al., 2012; Chang et al., 2014; Cirelli et al., 2014), we employ state-of-the-art machine-learning techniques (Nikulin et al., 2011; Daehne et al., 2014; Haufe et al., 2014) to track the activity of relevant components in source space, and test for links with behaviour. METHODS. In an active listening experiment (Bekius et al., 2015), participants (n=26) were asked to rate the degree of regularity of sequences of 9-11 tones, with an underlying beat period of 340, 400 or 460 ms inter-onset-interval, and different degree of irregularity (0 vs. 30% jitter). Continuous EEG was epoched into 2-beat periods, wavelet analysis applied to calculate spectrograms, and Fourier transformation to obtain modulation power as a function of frequency, with focus on the beat period. RESULTS. Running the analysis in on more traditional formats (single channel, Laplace, beam former) yield very limited results. Plugging in our customized pipeline that combines spatio-spectral decomposition with a novel source separation framework allows extracting components with a beat-related modulation of beta-band specific activity and correlation with behavior (Spearman’s rho >0.5, p<0.01). CONCLUSION. Initial results look promising, in terms of EEG beta band power and even a possible link with perceptual performance, but with limitations in statistical stability and consistency with pre-existing work, warranting further testing and critical discussion.
References:
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Original language | English |
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Publication date | 9 Jul 2018 |
Number of pages | 1 |
Publication status | Published - 9 Jul 2018 |
Event | 11th FENS Forum of Neuroscience: Federation of European Neuroscience Societies - CityCube Berlin, Berlin, Germany Duration: 7 Jul 2018 → 11 Jul 2018 http://www.fens.org |
Conference
Conference | 11th FENS Forum of Neuroscience |
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Location | CityCube Berlin |
Country/Territory | Germany |
City | Berlin |
Period | 07/07/2018 → 11/07/2018 |
Internet address |
Keywords
- auditory, rhythm, regularity, beat, beta band, EEG.