Influence of very low doses of mediators on fungal laccase activity - nonlinearity beyond imagination |
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Authors: | Elzbieta Malarczyk Janina Kochmanska-Rdest Anna Jarosz-Wilkolazka |
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Institution: | 1. Department of Mathematical Information Technology, University of Jyv?skyl?, Jyv?skyl?, Finland 2. Department of Psychology, University of Jyv?skyl?, Jyv?skyl?, Finland 3. Hangzhou Applied Acoustic Institute, Hangzhou, PR, China
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Abstract: | Background Compared to the waveform or spectrum analysis of event-related potentials (ERPs), time-frequency representation (TFR) has
the advantage of revealing the ERPs time and frequency domain information simultaneously. As the human brain could be modeled
as a complicated nonlinear system, it is interesting from the view of psychological knowledge to study the performance of
the nonlinear and linear time-frequency representation methods for ERP research. In this study Hilbert-Huang transformation
(HHT) and Morlet wavelet transformation (MWT) were performed on mismatch negativity (MMN) of children. Participants were 102
children aged 8–16 years. MMN was elicited in a passive oddball paradigm with duration deviants. The stimuli consisted of
an uninterrupted sound including two alternating 100 ms tones (600 and 800 Hz) with infrequent 50 ms or 30 ms 600 Hz deviant
tones. In theory larger deviant should elicit larger MMN. This theoretical expectation is used as a criterion to test two
TFR methods in this study. For statistical analysis MMN support to absence ratio (SAR) could be utilized to qualify TFR of
MMN. |
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