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Insect larvae clearly react to visual stimuli, but the ability of any visual neuron in a newly hatched insect to respond selectively to particular stimuli has not been directly tested. We characterised a pair of neurons in locust larvae that have been extensively studied in adults, where they are known to respond selectively to objects approaching on a collision course: the lobula giant motion detector (LGMD) and its postsynaptic partner, the descending contralateral motion detector (DCMD). Our physiological recordings of DCMD axon spikes reveal that at the time of hatching, the neurons already respond selectively to objects approaching the locust and they discriminate between stimulus approach speeds with differences in spike frequency. For a particular approaching stimulus, both the number and peak frequency of spikes increase with instar. In contrast, the number of spikes in responses to receding stimuli decreases with instar, so performance in discriminating approaching from receding stimuli improves as the locust goes through successive moults. In all instars, visual movement over one part of the visual field suppresses a response to movement over another part. 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. © 2013. Published by The Company of Biologists Ltd.


Documento: Artículo
Título:Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria
Autor:Simmons, P.J.; Sztarker, J.; Rind, F.C.
Filiación:Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
Departamento de Fisiología, Biología Molecular y Celular, FCEN, Universidad de Buenos Aires, Pabellon 2 Ciudad Universitaria, Intendente Guiraldes 2160, Buenos Aires 1428, Argentina
Palabras clave:Development; Insect; Larva; Looming; Synapse; Vision; animal; article; development; electrophysiology; growth, development and aging; insect; interneuron; larva; Locusta migratoria; looming; movement perception; optic lobe; photostimulation; physiology; synapse; transmission electron microscopy; ultrastructure; vision; visual system; development; insect; larva; looming; synapse; vision; Animals; Electrophysiology; Interneurons; Larva; Locusta migratoria; Microscopy, Electron, Transmission; Motion Perception; Optic Lobe, Nonmammalian; Photic Stimulation; Visual Pathways; Acrididae; Arthropoda; Hexapoda; Locusta migratoria
Página de inicio:2266
Página de fin:2275
Título revista:Journal of Experimental Biology
Título revista abreviado:J. Exp. Biol.


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---------- APA ----------
Simmons, P.J., Sztarker, J. & Rind, F.C. (2013) . Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria. Journal of Experimental Biology, 216(12), 2266-2275.
---------- CHICAGO ----------
Simmons, P.J., Sztarker, J., Rind, F.C. "Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria" . Journal of Experimental Biology 216, no. 12 (2013) : 2266-2275.
---------- MLA ----------
Simmons, P.J., Sztarker, J., Rind, F.C. "Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria" . Journal of Experimental Biology, vol. 216, no. 12, 2013, pp. 2266-2275.
---------- VANCOUVER ----------
Simmons, P.J., Sztarker, J., Rind, F.C. Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria. J. Exp. Biol. 2013;216(12):2266-2275.