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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
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    Summary

    Human-horse interactions show measurable physiological coupling. Heart rate variability analysis reveals distinct interaction phases, enabling accurate classification of human-animal dynamics.

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    Area of Science:

    • Physiology
    • Animal Behavior
    • Human-Animal Interaction

    Background:

    • Understanding the physiological basis of human-animal interaction is crucial.
    • Previous research has explored behavioral aspects, but quantitative physiological coupling remains less understood.
    • Heart rate variability (HRV) offers a non-invasive window into autonomic nervous system dynamics during social interactions.

    Purpose of the Study:

    • To quantitatively estimate the dynamic interaction between humans and horses.
    • To investigate physiological coupling through heartbeat dynamics across different interaction conditions.
    • To identify distinct phases of human-horse interaction based on physiological synchrony.

    Main Methods:

    • Analysis of heart rate variability (HRV) time series from eleven human subjects and one horse.
    • Utilized Magnitude Squared Coherence (MSC), Mean Phase Coherence (MPC), and Dynamic Time Warping (DTW) to assess coupling.
    • Compared physiological data across three conditions: no interaction, visual/olfactory interaction, and grooming.

    Main Results:

    • Statistically significant differences in coupling indices (MSC, MPC, DTW) were observed across the three interaction conditions.
    • A Nearest Mean Classifier achieved over 70% accuracy in distinguishing between the interaction phases.
    • These findings demonstrate quantifiable physiological synchrony between humans and horses during interaction.

    Conclusions:

    • The study provides evidence for distinct physiological coupling phases in human-horse interactions.
    • Quantitative analysis of HRV can differentiate between various levels of human-animal engagement.
    • These results support the empirical validation of the human-horse relationship through physiological measures.