What is it about?
This study shows that individual fruit flies differ consistently in how strongly they react to sensory stimuli. Using a light‑off startle paradigm and dynamical modeling, we show that a fly’s level of sensory reactivity and habituation learning are (highly) stable across a two‑week period, a substantial portion of its lifespan. This means that what may look like random behavioral variability actually reflects intrinsic, individual properties of the nervous system. Our work provides a powerful framework for studying the origins of individual differences in sensory processing, in health and disease.
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Photo by Rupert Britton on Unsplash
Why is it important?
Individual differences in sensory processing are well known in humans and other animals, but the mechanisms behind them remain poorly understood. By showing that fruit flies have stable, trait‑like individuality in both sensory reactivity and habituation learning, we provide a simple, living model system that makes these differences easier to study. Understanding why individuals differ may help uncover general principles of sensory variability—highly relevant for neurodevelopment and related disorders, where variability is the norm rather than the exception.
Perspectives
I love the Harvard Law of Animal Behavior—“Under the most rigorously controlled experimental conditions… the organism will do as it damn well pleases”—because it captures both the joy and the challenge of studying behavior. In our work, what excited me most was discovering that fruit flies don’t just behave differently from one another; they do so consistently across a large portion of their lives. That means these differences aren’t just noise (as the Harvard Law implies)—there is something intrinsic to each fly that shapes how it reacts to the world. Seeing this level of individuality emerge so clearly was both surprising and motivating, because it opens the door to understanding why individuals differ. I’m proud that our study helps set the stage for uncovering the sources of this variability.
Marina Boon
Radboud Universiteit
Read the Original
This page is a summary of: Dynamical modeling of individual sensory reactivity and habituation learning, Proceedings of the National Academy of Sciences, March 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2524738123.
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