Horses Categorize Human Emotions Cross-Modally Based on Facial Expression and Non-Verbal Vocalizations.
Authors: Trösch Miléna, Cuzol Florent, Parias Céline, Calandreau Ludovic, Nowak Raymond, Lansade Léa
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Researchers investigating whether horses can integrate visual and auditory emotional cues from humans presented paired animations of angry and joyful facial expressions alongside emotional non-verbal vocalisations (laughter, crying, anger sounds) to determine if equines recognise congruence between these signals. The experimental design measured gaze behaviour, locomotor activity, and heart rate responses as horses were exposed to matched or mismatched emotion pairings across the two sensory modalities. Horses demonstrated cross-modal emotional recognition by preferentially viewing the facial expression incongruent with the vocalisation—suggesting they expected emotional consistency and were intrigued by the mismatch—whilst simultaneously responding physiologically and behaviourally in line with the acoustic signal's emotional valence, including measurable changes in cardiac parameters. This capacity to recognise and emotionally react to human non-verbal emotional cues has meaningful implications for daily handling practices, training protocols, and yard management; handlers' stress levels, frustration, or anxiety communicated through voice tone and facial demeanour may directly influence equine behaviour and stress responses regardless of conscious intent. Understanding that horses genuinely perceive and process human emotional states should inform how professionals interact with horses during potentially challenging situations, suggesting that emotional regulation and consistent, calm communication may be as physiologically significant to equine welfare as the technical aspects of care.
Read the full abstract on PubMed
Practical Takeaways
- •Horses are sensitive to human emotional states expressed through both facial expressions and voice tone; handlers should be aware their emotional displays are perceived and affect horses.
- •The cross-modal emotional recognition ability in horses suggests they can distinguish between incongruent emotional signals (e.g., smiling while speaking angrily), which may influence their responses and behavior during handling.
- •Understanding that horses react emotionally and physiologically to human emotions supports the importance of maintaining calm, consistent emotional presentation during training and veterinary procedures.
Key Findings
- •Horses looked longer at facial expressions incongruent with accompanying emotional vocalizations, suggesting they detected the mismatch between visual and auditory emotional cues.
- •Horses demonstrated physiological responses (heart rate changes) and behavioral reactions consistent with the valence of human non-verbal vocalizations.
- •Horses can cross-modally categorize human emotions by integrating facial expressions and vocal emotional stimuli into unified perceptual categories.