title: Feature selection for speech emotion recognition in Spanish and Basque: on the use of machine learning to improve human-computer interaction.
abstract: Study of emotions in human-computer interaction is a growing research area. This paper shows an attempt to select the most significant features for emotion recognition in spoken Basque and Spanish Languages using different methods for feature selection. RekEmozio database was used as the experimental data set. Several Machine Learning paradigms were used for the emotion classification task. Experiments were executed in three phases, using different sets of features as classification variables in each phase. Moreover, feature subset selection was applied at each phase in order to seek for the most relevant feature subset. The three phases approach was selected to check the validity of the proposed approach. Achieved results show that an instance-based learning algorithm using feature subset selection techniques based on evolutionary algorithms is the best Machine Learning paradigm in automatic emotion recognition, with all different feature sets, obtaining a mean of 80,05% emotion recognition rate in Basque and a 74,82% in Spanish. In order to check the goodness of the proposed process, a greedy searching approach (FSS-Forward) has been applied and a comparison between them is provided. Based on achieved results, a set of most relevant non-speaker dependent features is proposed for both languages and new perspectives are suggested.
authors.affiliation: Computer Science Faculty (University of the Basque Country), San Sebastián, Spain.
authors.forename: Andoni
authors.initials: A
authors.lastname: Arruti
authors.affiliation: Computer Science Faculty (University of the Basque Country), San Sebastián, Spain.
authors.forename: Idoia
authors.initials: I
authors.lastname: Cearreta
authors.affiliation: Vicomtech-IK4 Research Alliance, San Sebastián, Spain.
authors.forename: Aitor
authors.initials: A
authors.lastname: Alvarez
authors.affiliation: Computer Science Faculty (University of the Basque Country), San Sebastián, Spain.
authors.forename: Elena
authors.initials: E
authors.lastname: Lazkano
authors.affiliation: Computer Science Faculty (University of the Basque Country), San Sebastián, Spain.
authors.forename: Basilio
authors.initials: B
authors.lastname: Sierra
mesh_terms: D000465:Algorithms; D004644:Emotions; D006801:Humans; D000069550:Machine Learning; D010363:Pattern Recognition, Automated / Q000379:methods*; D013060:Speech; D014584:User-Computer Interface