Editorial: Emotions and emotional interplay within and between species: A "one welfare" perspective

Finding a standard interdisciplinary definition of emotion is challenging, but we affirm that “an emotion is an internal process triggered by specific stimuli relevant to the subject.” Moreover, following the well-known Circumplex Model of Affects (CMA) (1), an emotional reaction can be interpreted as a point in a multidimensional space where each dimension is in charge of representing a specific reaction of the organism, such as pleasantness, arousal, or sadness. Of note, the most applied CMA model in research on animal emotions is the bi-axial framework which considers only the valence (positive or negative) and arousal (high or low) axes.