Responses to object approach by a wide field visual neurone, the LGMD2 of the locust: Characterization and image cues

@article{Simmons1997ResponsesTO,
  title={Responses to object approach by a wide field visual neurone, the LGMD2 of the locust: Characterization and image cues},
  author={Peter J. Simmons and F. Claire Rind},
  journal={Journal of Comparative Physiology A},
  year={1997},
  volume={180},
  pages={203-214}
}
  • P. Simmons, F. Rind
  • Published 14 February 1997
  • Computer Science
  • Journal of Comparative Physiology A
Abstract The LGMD2 belongs to a group of giant movement-detecting neurones which have fan-shaped arbors in the lobula of the locust optic lobe and respond to movements of objects. One of these neurones, the LGMD1, has been shown to respond directionally to movements of objects in depth, generating vigorous, maintained spike discharges during object approach. Here we compare the responses of the LGMD2 neurone with those of the LGMD1 to simulated movements of objects in depth and examine… 
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Citation Type

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Immunocytochemical evidence that collision sensing neurons in the locust visual system contain acetylcholine
TLDR
Immunocytochemical evidence is presented, using antibodies against choline–protein conjugates and a polyclonal antiserum against ChAT, that the LGMD1 and ‐2 and the retinotopic units presynaptic to them contain acetylcholine (ACh).
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TLDR
Electron microscopy demonstrates that the anatomical substrate for the selective response to approaching stimuli is present in all larval instars: small neuronal processes carrying information from the eye make synapses both onto LGMD dendrites and with each other, providing pathways for lateral inhibition that shape selectivity for approaching objects.
Abbreviated title : Development of LGMDs and hiding behavior
TLDR
This study describes a practical method combining classical staining techniques and 3D neuronal reconstructions that can be used, even in small insects, to reveal detailed anatomy of individual neurons in all stages of the post-embryonic development of Locusta migratoria.
Two identified looming detectors in the locust: ubiquitous lateral connections among their inputs contribute to selective responses to looming objects
TLDR
Reconstructions reveal that reciprocal inhibitory synapses increased the LGMD’s selectivity for looming over passing objects, particularly at the beginning of object approach.
A look into the cockpit of the developing locust: Looming detectors and predator avoidance
TLDR
A practical method combining classical staining techniques and 3D neuronal reconstructions that can be used, even in small insects, to reveal detailed anatomy of individual neurons in all stages of the post‐embryonic development of Locusta migratoria is described.
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Collision Selective Visual Neural Network Inspired by LGMD2 Neurons in Juvenile Locusts
TLDR
A novel way of modeling LGMD2 neuron is proposed, with biased ON and OFF pathways splitting visual streams into parallel channels encoding brightness increments and decrements separately to fulfill its selectivity, and a biophysical mechanism of spike frequency adaptation to shape the looming selectivity in such a collision-detecting neuron model.
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