Applying machine learning EEG signal classification to emotion‑related brain anticipatory activity

Abstract

Machine learning approaches have been fruitfully applied to several neurophysiological signal classification problems. Considering the relevance of emotion in human cognition and behaviour, an important application of machine learning has been found in the field of emotion identification based on neurophysiological activity. Nonetheless, there is high variability in results in the literature depending on the neuronal activity measurement, the signal features and the classifier type. The present work aims to provide new methodological insight into machine learning applied to emotion identification based on electrophysiological brain activity. For this reason, we analysed previously recorded EEG activity measured while emotional stimuli, high and low arousal (auditory and visual) were provided to a group of healthy participants. Our target signal to classify was the pre-stimulus onset brain activity. Classification performance of three different classifiers (LDA, SVM and kNN) was compared using both spectral and temporal features. Furthermore, we also contrasted the performance of static and dynamic (time evolving) approaches. The best static feature-classifier combination was the SVM with spectral features (51.8%), followed by LDA with spectral features (51.4%) and kNN with temporal features (51%). The best dynamic feature‑classifier combination was the SVM with temporal features (63.8%), followed by kNN with temporal features (63.70%) and LDA with temporal features (63.68%). The results show a clear increase in classification accuracy with temporal dynamic features.

I DARE: IULM Dataset of Affective Responses

“…We contend that the diffusion of AD models within Neuromarketing and Consumer Neuroscience could be increased by addressing the limitations of existing datasets. We believe that the strictest one is the use of videos as a unique elicitation method, which may lead to AD models that are unsuitable for the evaluation of static or short-term stimuli (e.g., static creativities, product packaging, or landing pages), as well as for a dynamic classification (Bilucaglia et al, 2021 ) of multi-frame stimuli (e.g., video commercials). A less severe (but still present) limitation is the varying number of stimuli that affects the minimum detectable effect size and, in turn, the reliability and generalizability of the results (Funder and Ozer, 2019 ).…”