scholarly journals Response: Commentary: Is So-Called “Split Alpha” in EEG Spectral Analysis a Result of Methodological and Interpretation Errors?

2021 ◽  
Vol 15 ◽  
Author(s):  
Ewa Zalewska
Keyword(s):  
Spectral Analysis ◽  
Eeg Spectral Analysis ◽  
Interpretation Errors

scholarly journals Is So Called “Split Alpha” in EEG Spectral Analysis a Result of Methodological and Interpretation Errors?

2020 ◽  
Vol 14 ◽  
Author(s):  
Ewa Zalewska
Keyword(s):  
Spectral Analysis ◽  
Time Window ◽  
Frequency Resolution ◽  
Eeg Signal ◽  
Eeg Spectral Analysis ◽  
Spectral Leakage ◽  
Eeg Spectrum ◽  
Interpretation Errors ◽  
Signal Dependence ◽  
Short Signal

This paper attempts to explain some methodological issues regarding EEG signal analysis which might lead to misinterpretation and therefore to unsubstantiated conclusions. The so called “split-alpha,” a “new phenomenon” in EEG spectral analysis described lately in few papers is such a case. We have shown that spectrum feature presented as a “split alpha” can be the result of applying improper means of analysis of the spectrum of the EEG signal that did not take into account the significant properties of the applied Fast Fourier Transform (FFT) method. Analysis of the shortcomings of the FFT method applied to EEG signal such as limited duration of analyzed signal, dependence of frequency resolution on time window duration, influence of window duration and shape, overlapping and spectral leakage was performed. Our analyses of EEG data as well as simulations indicate that double alpha spectra called as “split alpha” can appear, as spurious peaks, for short signal window when the EEG signal being studied shows multiple frequencies and frequency bands. These peaks have no relation to any frequencies of the signal and are an effect of spectrum leakage. Our paper is intended to explain the reasons underlying a spectrum pattern called as a “split alpha” and give some practical indications for using spectral analysis of EEG signal that might be useful for readers and allow to avoid EEG spectrum misinterpretation in further studies and publications as well as in clinical practice.

BIO-ELECTRICAL BRAIN RELATIONS OF PAIN AND ACUPUNCTURE EFFECTS ON EEG SPECTRAL ANALYSIS IN HEALTHY VOLUNTEERS

1986 ◽  
Vol 11 (3) ◽  
pp. 199-205 ◽  
Author(s):  
G. Varrassi ◽  
V. Manna ◽  
G. Moffa ◽  
F. Cassabgi
Keyword(s):  
Spectral Analysis ◽  
Healthy Volunteers ◽  
Eeg Spectral Analysis ◽  
Acupuncture Effects

EEG spectral analysis after minor head injury in man

1988 ◽  
Vol 70 (2) ◽  
pp. 185-189 ◽  
Author(s):  
M.T. Tebano ◽  
M. Cameroni ◽  
G. Gallozzi ◽  
A. Loizzo ◽  
G. Palazzino ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Head Injury ◽  
Minor Head Injury ◽  
Eeg Spectral Analysis

Identifying academic aptitude in adolescent children by psychological testing and EEG spectral analysis

1981 ◽  
Vol 19 (1) ◽  
pp. 79-86 ◽  
Author(s):  
R.V.E. Grunau ◽  
S.J. Purves ◽  
A.K. McBurney ◽  
M.D. Low
Keyword(s):  
Spectral Analysis ◽  
Psychological Testing ◽  
Eeg Spectral Analysis ◽  
Academic Aptitude

REM sleep EEG spectral analysis in patients with first-episode schizophrenia

2008 ◽  
Vol 42 (13) ◽  
pp. 1086-1093 ◽  
Author(s):  
Julie Poulin ◽  
Emmanuel Stip ◽  
Roger Godbout
Keyword(s):  
Spectral Analysis ◽  
Rem Sleep ◽  
Sleep Eeg ◽  
First Episode ◽  
Eeg Spectral Analysis ◽  
First Episode Schizophrenia

EEG Spectral Analysis

2018 ◽  
pp. 35-53
Author(s):  
Do-Won Kim ◽  
Chang-Hwan Im
Keyword(s):  
Spectral Analysis ◽  
Eeg Spectral Analysis

scholarly journals EEG Spectral Analysis of the Sleep-onset Period in Narcoleptics and Normal Sleepers

SLEEP ◽  
1999 ◽  
Vol 22 (2) ◽  
pp. 191-203 ◽  
Author(s):  
Christi E. D. Alloway ◽  
Robert D. Ogilvie ◽  
Colin M. Shapiro
Keyword(s):  
Spectral Analysis ◽  
Sleep Onset ◽  
Eeg Spectral Analysis ◽  
Onset Period

Longitudinal EEG spectral analysis in early stage of Alzheimer's disease

1989 ◽  
Vol 72 (4) ◽  
pp. 290-297 ◽  
Author(s):  
H. Soininen ◽  
J. Partanen ◽  
V. Laulumaa ◽  
E.-L. Helkala ◽  
M. Laakso ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Spectral Analysis ◽  
Early Stage ◽  
Eeg Spectral Analysis
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