Study Shows Fruit Flies Learn to Prefer Immobile Balls
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- Harvard neuroscientists reported in Current Biology (2025) that Drosophila melanogaster can learn to prefer immobile spherical objects through repeated physical interaction.
- Researchers guided flies using an optomotor response by projecting a rotating pinwheel of blue and black stripes, causing flies to turn left or right as a steering mechanism.
- Flies performed five distinct ball‑interaction motifs—including ball walk, rolling, jumping, and throwing—over nearly 30,000 interactions by 48 male flies.
- The flies showed a marked preference for immobile balls over mobile ones after repeated exposure, indicating learning of the ball’s physical properties.
- Silencing H‑Delta neurons in the central complex significantly reduced the learned preference for immobile balls, implicating these neurons in the behavior.
- The study is the first documentation of structured learning and adaptive exploration in a minimal nervous system, challenging assumptions about fruit‑fly intelligence.
Why it matters: Neuroscientists and AI researchers gain a new model of learning in tiny brains, challenging the view that complex cognition requires large neural circuits and opening avenues for biologically inspired algorithms; the finding may shift how labs use fruit flies as proxies for studying sensorimotor learning.
