Researchers from Hartpury University, University of Plymouth, University of Newcastle, and University of Mississippi have discovered that emotional arousal is linked to changes in vocalisations made by domestic chicks, reinforcing the potential of these sounds as potent markers of an animal’s emotional state. The findings mean animal keepers can potentially use these sounds to detect shifts in emotion in captive animals, informing welfare assessments and potential improvements.
The pioneering study delved into vocal changes in Legbar chicks (Gallus gallus dom.), particularly in situations of negative emotion states like distress. The group recorded and analysed the acoustic parameters of distress vocalisations from chicks during complete isolation, or in presence of a mirror (with the reflection acting as another chick). Vocalisations were then compared between the isolated and mirror conditions, revealing distinct differences in call characteristics associated with emotional arousal.
Chicks in full social isolation produced calls that were louder, higher in frequency, more degraded, and longer, indicative of higher arousal levels and therefore greater distress.
The study’s outcomes align with similar patters observed in mammalian vocalisations, reinforcing a consistent relationship between emotional arousal and vocal parameters across species.
The research paves the way for further exploration of similar links in other animal groups and sets the stage for leveraging vocal changes to automatically detect emotional shifts in animals, contributing to advancements in the field of animal welfare science.
Dr Ben Brilot, Associate Head of Animal at Hartpury University said: “This research is another key bit of evidence that animal calls can give us a window into their emotional state, much like we can tell how distressed a person is from the quality of their voice. It has potential application for automated monitoring of animals in contexts where they might not have constant surveillance by human caretakers”
Study Animal at Hartpury University
The physical and emotional needs of animals is at the heart of everything we do. Working with research-active staff, our students contribute to studies that are helping us understand animals like never before. The ever-popular BSc (Hons) Zoology is ideal for those seeking to better understand and protect animal species across the globe. Other degrees include BSc (Hons) Animal Behaviour and Welfare and BSc (Hons) Human-Animal Interaction with Psychology, as well as undergraduate degrees including MSc Biodiversity Conservation and MSc Applied Animal Behaviour and Welfare. All aim to provide students with the knowledge and skills to ultimately improve the lives of animals and those who interact or take care of them.
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