Key result
A proposed k-fold approach for feature selection in emotional assessment using wearable sensors outperformed the conventional standard error function by 4%, reaching an accuracy near 78%.
Why the study?
Assessing emotional state in real time using non-invasive biosignals requires finding effective markers while reducing the loss of generalization and computational cost.
A proposed k-fold feature selection algorithm improves the accuracy of emotional state classification using wearable ECG and thoracic impedance sensors to near 78% while reducing computational cost.
May enhance wearable sensor-based emotion detection; hypothesis-generating and requires prospective clinical validation before adoption.
Assessing emotional state is an emerging application field boosting research activities on the topic of analysis of non-invasive biosignals to find effective markers to accurately determine the emotional state in real-time. Nowadays using wearable sensors, electrocardiogram and thoracic impedance measurements can be recorded, facilitating analyzing cardiac and respiratory functions directly and autonomic nervous system function indirectly. Such analysis allows distinguishing between different emotional states: neutral, sadness, and disgust. This work was specifically focused on the proposal of a k-fold approach for selecting features while training the classifier that reduces the loss of generalization. The performance of the proposed algorithm used as the selection criterion was compared to the commonly used standard error function. The proposed k-fold approach outperforms the conventional method with 4% hit success rate improvement, reaching an accuracy near to 78%. Moreover, the proposed selection criterion method allows the classifier to produce the best performance using a lower number of features at lower computational cost. A reduced number of features reduces the risk of overfitting while a lower computational cost contributes to implementing real-time systems using wearable electronics.
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Mohíno-Herranz et al. (2020) studied Emotional state assessment. k-fold approach for feature selection vs. standard error function was evaluated on Accuracy (hit success rate). A proposed k-fold approach for feature selection in emotional assessment using wearable sensors outperformed the conventional standard error function by 4%, reaching an accuracy near 78%.
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