Indicators of age, body size and sex in goat kid calls revealed using the source-filter theory

The source-filter theory is an important framework recently applied to the study of animal vocalisations, which links the mode of vocal production to call parameters. Vocalisations can be good indicators of a sender’s characteristics, such as identity, body size, age, and even hormonal status and affective states. For these reasons, applied vocal communication research would […]

Human laughter, social play, and play vocalizations of non-human primates: an evolutionary approach

It has been hypothesized that the evolutionary origin of human laughter lies in the facial play signals of non-human primates. Recent studies dealing with human laughter have stressed the importance of the acoustic component of this nonverbal behaviour. In this study, we analysed the occurrence and some acoustic parameters, such as interval durations and fundamental […]

Vocal correlates of emotional reactivity within and across contexts in domestic pigs (Sus scrofa)

Vocalizations have long been recognized to encode information about an individual’s emotional state and, as such, have contributed to the study of emotions in animals. However, the potential of vocalizations to also encode information about an individual’s emotional reactivity has received much less attention. In this study, we aimed to test whether the vocalizations of […]