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arXiv · 2502.16088

Electrophysiological Investigation of Insect Pain Threshold

Marc Josep Montagut Marques·Pan Minghao·Ryuichi Okada·Midori Sakura·Kayo Hirose·Shinjiro Umezu
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Abstract

The question of whether insects experience pain has long been debated in neuroscience and animal behavior research. Increasing evidence suggests that insects possess the ability to detect and respond to noxious stimuli, exhibiting behaviors indicative of pain perception. This study investigates the relationship between pain stimuli and physiological responses in crickets (Gryllidae), focusing on heart rate (ECG) and brain wave (EEG) patterns. We applied a range of mechanical, chemical, thermal, and electrical stimuli to crickets, recording ECG and EEG data while employing a deep learning-based model to classify pain levels. Our findings revealed significant heart rate changes and EEG fluctuations in response to various stimuli, with the highest intensity stimuli inducing marked physiological stress. The AI-based analysis, utilizing AlexNet for EEG signal classification, achieved 90% accuracy in distinguishing between resting, low-pain, and high-pain states. While no social sharing of pain was observed through ECG measurements, these results contribute to the growing body of evidence supporting insect nociception and offer new insights into their physiological responses to external stressors. This research advances the understanding of insect pain mechanisms and demonstrates the potential for AI-driven analysis in entomological studies.

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Marc Josep Montagut Marques, Pan Minghao, Ryuichi Okada, Midori Sakura, Kayo Hirose, Shinjiro Umezu. 2025-02-22. Electrophysiological Investigation of Insect Pain Threshold. https://arxiv.org/abs/2502.16088

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