Time-frequency feature extraction for classification of episodic memory
Anderson, Rachele LU
and Sandsten, Maria
LU
(2020)
In Eurasip Journal on Advances in Signal Processing
- Abstract
- This paper investigates the extraction of time-frequency (TF) features for classification of electroencephalography (EEG) signals and episodic memory. We propose a model based on the definition of locally stationary processes (LSPs), estimate the model parameters, and derive a mean square error (MSE) optimal Wigner-Ville spectrum (WVS) estimator for the signals. The estimator is compared with state-of-the-art TF representations: the spectrogram, the Welch method, the classically estimated WVS, and the Morlet wavelet scalogram. First, we evaluate the MSE of each spectrum estimate with respect to the true WVS for simulated data, where it is shown that the LSP-inference MSE optimal estimator clearly outperforms other methods. Then, we use the... (More)
- This paper investigates the extraction of time-frequency (TF) features for classification of electroencephalography (EEG) signals and episodic memory. We propose a model based on the definition of locally stationary processes (LSPs), estimate the model parameters, and derive a mean square error (MSE) optimal Wigner-Ville spectrum (WVS) estimator for the signals. The estimator is compared with state-of-the-art TF representations: the spectrogram, the Welch method, the classically estimated WVS, and the Morlet wavelet scalogram. First, we evaluate the MSE of each spectrum estimate with respect to the true WVS for simulated data, where it is shown that the LSP-inference MSE optimal estimator clearly outperforms other methods. Then, we use the different TF representations to extract the features which feed a neural network classifier and compare the classification accuracies for simulated datasets. Finally, we provide an example of real data application on EEG signals measured during a visual memory encoding task, where the classification accuracy is evaluated as in the simulation study. The results show consistent improvement in classification accuracy by using the features extracted from the proposed LSP-inference MSE optimal estimator, compared to the use of state-of-the-art methods, both for simulated datasets and for the real data example. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8575f595-b7a4-488f-ae93-84a3d6ed4517
- author
- Anderson, Rachele
LU
and Sandsten, Maria
LU
- organization
- publishing date
- 2020-05-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- time-frequency features, classification, non-stationary signals, neural networks, EEG signals, Locally Stationary Processes, optimal spectral estimation
- in
- Eurasip Journal on Advances in Signal Processing
- article number
- 19
- publisher
- Hindawi Limited
- external identifiers
-
- scopus:85083994774
- ISSN
- 1687-6180
- DOI
- 10.1186/s13634-020-00681-8
- language
- English
- LU publication?
- yes
- id
- 8575f595-b7a4-488f-ae93-84a3d6ed4517
- date added to LUP
- 2020-05-05 10:14:03
- date last changed
- 2022-04-18 22:01:37
@article{8575f595-b7a4-488f-ae93-84a3d6ed4517,
abstract = {{This paper investigates the extraction of time-frequency (TF) features for classification of electroencephalography (EEG) signals and episodic memory. We propose a model based on the definition of locally stationary processes (LSPs), estimate the model parameters, and derive a mean square error (MSE) optimal Wigner-Ville spectrum (WVS) estimator for the signals. The estimator is compared with state-of-the-art TF representations: the spectrogram, the Welch method, the classically estimated WVS, and the Morlet wavelet scalogram. First, we evaluate the MSE of each spectrum estimate with respect to the true WVS for simulated data, where it is shown that the LSP-inference MSE optimal estimator clearly outperforms other methods. Then, we use the different TF representations to extract the features which feed a neural network classifier and compare the classification accuracies for simulated datasets. Finally, we provide an example of real data application on EEG signals measured during a visual memory encoding task, where the classification accuracy is evaluated as in the simulation study. The results show consistent improvement in classification accuracy by using the features extracted from the proposed LSP-inference MSE optimal estimator, compared to the use of state-of-the-art methods, both for simulated datasets and for the real data example.}},
author = {{Anderson, Rachele and Sandsten, Maria}},
issn = {{1687-6180}},
keywords = {{time-frequency features; classification; non-stationary signals; neural networks; EEG signals; Locally Stationary Processes; optimal spectral estimation}},
language = {{eng}},
month = {{05}},
publisher = {{Hindawi Limited}},
series = {{Eurasip Journal on Advances in Signal Processing}},
title = {{Time-frequency feature extraction for classification of episodic memory}},
url = {{http://dx.doi.org/10.1186/s13634-020-00681-8}},
doi = {{10.1186/s13634-020-00681-8}},
year = {{2020}},
}