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Table 1. DEAP data format
Array name Array shape Array contents
data 40 x 40 x
8064 video/trial x channel x data
labels 40 x 4 video/trial x label (valence,
arousal, dominance, liking)
DEAP uses an EEG with 32 electrodes. Figure 4 shows the electrode
arrangement of the EEG used in the experiment.
Figure 4. Electrode position in 10-20 method
Similar signals can be obtained from adjacent electrodes, but the signals
acquired from the distant electrode are not similar as the nearer electrodes. This
motivates us to investigate the selection of effective electrodes.
2.2.2 Division of EEG
Since the EEG signals were taken at the time of watching a 60-s moving image, each
data is composed of 60 seconds. Candra and colleagues examined the appropriate
window size in recognition of Valence and Arousal's emotions using DEAP [16], which
suggested that it would be better to divide the electroencephalogram data every 6 seconds
and proceed with the analysis. In this study, based on this result, the EEG was divided
every 6 seconds and analyzed.
Although the original signal was sampled at 128 Hz, it was separated into a γ
frequency band of 33 to 64 Hz, a β frequency band of 17 to 32 Hz and an α frequency
band of 9 to 16 Hz by wavelet transform as follows.
∑ ∑ (2)
2.2.3 Calculation of energy
By the processing so far, the EEG was divided every 6 seconds, and the EEG of each
segment was separated into three frequency bands γ, β, α. In order to investigate how
much EEGs of each separated frequency band are contained, energy of each frequency
band was calculated using Equation 3.
∑ (3)
Y.Tsurugasaki etal. / IdentificationofEffectiveEEGElectrodes
forDepressionSensing156
Intelligent Environments 2019
Workshop Proceedings of the 15th International Conference on Intelligent Environments
- Titel
- Intelligent Environments 2019
- Untertitel
- Workshop Proceedings of the 15th International Conference on Intelligent Environments
- Autoren
- Andrés Muñoz
- Sofia Ouhbi
- Wolfgang Minker
- Loubna Echabbi
- Miguel Navarro-Cía
- Verlag
- IOS Press BV
- Datum
- 2019
- Sprache
- deutsch
- Lizenz
- CC BY-NC 4.0
- ISBN
- 978-1-61499-983-6
- Abmessungen
- 16.0 x 24.0 cm
- Seiten
- 416
- Kategorie
- Tagungsbände