A looming-sensitive pathway responds to changes in the trajectory of object motion

Journal of Neurophysiology
Glyn A McMillan, John R Gray

Abstract

Two identified locust neurons, the lobula giant movement detector (LGMD) and its postsynaptic partner, the descending contralateral movement detector (DCMD), constitute one motion-sensitive pathway in the visual system that responds preferentially to objects that approach on a direct collision course and are implicated in collision-avoidance behavior. Previously described responses to the approach of paired objects and approaches at different time intervals (Guest BB, Gray JR. J Neurophysiol 95: 1428-1441, 2006) suggest that this pathway may also be affected by more complicated movements in the locust's visual environment. To test this possibility we presented stationary locusts with disks traveling along combinations of colliding (looming), noncolliding (translatory), and near-miss trajectories. Distinctly different responses to different trajectories and trajectory changes demonstrate that DCMD responds to complex aspects of local visual motion. DCMD peak firing rates associated with the time of collision remained relatively invariant after a trajectory change from translation to looming. Translatory motion initiated in the frontal visual field generated a larger peak firing rate relative to object motion initiated in the pos...Continue Reading

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Citations

Jul 23, 2014·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Monika J B EberhardBernhard Ronacher
May 13, 2014·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Indika Benaragama, John R Gray
Sep 16, 2014·Journal of Physiology, Paris·Florencia Scarano, Daniel Tomsic
Apr 14, 2017·Journal of Neurophysiology·Tobias Bockhorst, Uwe Homberg
Oct 21, 2018·The Journal of Experimental Biology·Tarquin P StottJohn R Gray
Oct 3, 2014·Journal of Neurophysiology·Ana C SilvaJohn R Gray

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