Animals & nature · 2012
How do dragonfly neurons signal which direction a target is moving?
A group of 16 neurons signals target direction through their combined activity, accurately and reliably across the full circle of directions. In this dragonfly study, the signals relayed direction information from the brain to the centers controlling wing movement. Response patterns were consistent across animals, although the rates at which neurons fired were not.
Details
Catching prey in midair requires tracking a moving target. Researchers studied the directional responses and structure of a group of 16 dragonfly neurons that carry target information from the brain toward the wing movement centers. Their combined activity represented target direction with high accuracy and reliability across 360°.
The regions of vision these neurons responded to matched the retinal area where prey is focused during hunting flights. Their response delays also matched the dragonflies’ reaction time. These matches support the relevance of the signals to prey tracking.
Across animals, each neuron type had consistent directional preferences and structural features, but firing rates varied. The central finding is therefore a reliable combined direction signal, not identical activity in every dragonfly. The abstract does not give a numerical error estimate for that signal, and the finding should not be taken to mean that these neurons alone explain every aspect of prey interception.
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