| Content Provider | Springer Nature : BioMed Central |
|---|---|
| Author | Demanuele, Charmaine James, Christopher J Sonuga-Barke, Edmund JS |
| Abstract | Background It has been acknowledged that the frequency spectrum of measured electromagnetic (EM) brain signals shows a decrease in power with increasing frequency. This spectral behaviour may lead to difficulty in distinguishing event-related peaks from ongoing brain activity in the electro- and magnetoencephalographic (EEG and MEG) signal spectra. This can become an issue especially in the analysis of low frequency oscillations (LFOs) – below 0.5 Hz – which are currently being observed in signal recordings linked with specific pathologies such as epileptic seizures or attention deficit hyperactivity disorder (ADHD), in sleep studies, etc. Methods In this work we propose a simple method that can be used to compensate for this 1/f trend hence achieving spectral normalisation. This method involves filtering the raw measured EM signal through a differentiator prior to further data analysis. Results Applying the proposed method to various exemplary datasets including very low frequency EEG recordings, epileptic seizure recordings, MEG data and Evoked Response data showed that this compensating procedure provides a flat spectral base onto which event related peaks can be clearly observed. Conclusion Findings suggest that the proposed filter is a useful tool for the analysis of physiological data especially in revealing very low frequency peaks which may otherwise be obscured by the 1/f spectral activity inherent in EEG/MEG recordings. |
| Related Links | https://behavioralandbrainfunctions.biomedcentral.com/counter/pdf/10.1186/1744-9081-3-62.pdf |
| Ending Page | 14 |
| Page Count | 14 |
| Starting Page | 1 |
| File Format | HTM / HTML |
| ISSN | 17449081 |
| DOI | 10.1186/1744-9081-3-62 |
| Journal | Behavioral and Brain Functions |
| Issue Number | 1 |
| Volume Number | 3 |
| Language | English |
| Publisher | BioMed Central |
| Publisher Date | 2007-12-10 |
| Access Restriction | Open |
| Subject Keyword | Neurosciences Neurology Behavioral Therapy Psychiatry Finite Impulse Response Normalisation Curve Infinite Impulse Response Spectral Normalisation Spectral Activity |
| Content Type | Text |
| Resource Type | Article |
| Subject | Behavioral Neuroscience Medicine Biological Psychiatry Cognitive Neuroscience |
| Journal Impact Factor | 4.7/2023 |
| 5-Year Journal Impact Factor | 4.1/2023 |
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