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Role of an identified looming-sensitive neuron in triggering a flying locust's escape.
- R. Santer, F. Rind, R. Stafford, P. Simmons
- Biology, PsychologyJournal of neurophysiology
- 1 June 2006
Flight-gating of the DCMD response resulting from rhythmic modulation of the flight motor neuron's membrane potential during flight means that the locust's escape behavior can vary in response to the same looming stimulus, meaning that a predator cannot exploit predictability in the locUST's collision avoidance behavior.
Gliding behaviour elicited by lateral looming stimuli in flying locusts
Tethered, flying locusts with visual stimuli looming from the side towards one eye in a way that mimics the approach of a predatory bird are challenged and a close match is found between the visual stimuli that elicit a gliding behaviour and those that are effective at exciting the DCMD neuron.
Motor activity and trajectory control during escape jumping in the locust Locusta migratoria
The escape jumps that locusts produce in response to approaching objects are investigated and it is found that there are no bilateral differences in the motor programs of the left and right hindlegs that correlate with jump trajectory.
Arousal facilitates collision avoidance mediated by a looming sensitive visual neuron in a flying locust.
Investigating whether vision for action, when the locust is in an aroused state rather than a passive viewer, significantly alters visual processing in this collision-detecting pathway found that the DCMD response recovered from a previously habituated state; that it followed object motion throughout approach; and--most important--that it was significantly more likely to generate the maintained spike frequencies capable of evoking gliding dives even with extremely short intervals between approaches.
Preparing for escape: an examination of the role of the DCMD neuron in locust escape jumps
This study investigates a locust’s preparations to escape a looming stimulus and concurrent spiking activity in its pair of uniquely identifiable looming-detector neurons (the descending contralateral movement detectors; DCMDs), and finds that hindleg flexion in preparation for a jump occurs at the same time as high frequency DCMD spikes.
Multimodal courtship efficacy of Schizocosa retrorsa wolf spiders: implications of an additional signal modality
The observation that copulation success was independent of signaling environment suggests the use of an additional courtship signal modality.
Predator versus Prey: Locust Looming-Detector Neuron and Behavioural Responses to Stimuli Representing Attacking Bird Predators
Simulated looming discs are used to study glides in response to stimuli simulating bird attacks, and it is shown that both DCMD and behavioural responses are strong to stimuli with kite-like l/|v| ratios.
Reactive direction control for a mobile robot: a locust-like control of escape direction emerges when a bilateral pair of model locust visual neurons are integrated
Khepera robots equipped with normal and panoramic cameras and using ‘randomised winner-take-all’ or ‘steering wheel’ algorithms for LGMD model integration could escape an approaching threat in real time and with a similar distribution of escape directions as real locusts.
Escapes with and without preparation: the neuroethology of visual startle in locusts.
Collision avoidance and a looming sensitive neuron: size matters but biggest is not necessarily best
When a locust views small approaching objects, the response of theLGMD continues to increase throughout the object's approach and the locust is able to trigger escape behaviours without the LGMD response peaking prior to collision.