Abstract
1. 1. The neuronal organization of the detection and correction systems that enable locusts to flystraight are reviewed. 2. 2. Unintended deviations from course are detected by a number of exteroceptive systems including wind-sensitive hairs, compound eyes and ocelli. 3. 3. These exteroceptive signals and complementary proprioceptive signals are combined in a spatially compatible manner to generate feature detectors (the descending deviation detector interneurones) with emergent properties that relate directly to flight orientation and guidance tasks. 4. 4. The main influence of the descending deviation detector interneurones on the motor output is via intercalated thoracic interneurones, which gate the sensory signals at wingbeat frequency, thus ensuring that the corrective signals are applied at the appropriate points of the wingbeat cycle.
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