Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria
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 kn...
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paper:paper_00220949_v216_n12_p2266_Simmons2023-06-08T14:45:37Z Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria Sztarker, Julieta 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 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. Fil:Sztarker, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220949_v216_n12_p2266_Simmons http://hdl.handle.net/20.500.12110/paper_00220949_v216_n12_p2266_Simmons |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Sztarker, Julieta Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria |
| topic_facet |
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 |
| description |
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. |
| author |
Sztarker, Julieta |
| author_facet |
Sztarker, Julieta |
| author_sort |
Sztarker, Julieta |
| title |
Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria |
| title_short |
Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria |
| title_full |
Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria |
| title_fullStr |
Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria |
| title_full_unstemmed |
Looming detection by identified visual interneurons during larval development of the locust Locusta migratoria |
| title_sort |
looming detection by identified visual interneurons during larval development of the locust locusta migratoria |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220949_v216_n12_p2266_Simmons http://hdl.handle.net/20.500.12110/paper_00220949_v216_n12_p2266_Simmons |
| work_keys_str_mv |
AT sztarkerjulieta loomingdetectionbyidentifiedvisualinterneuronsduringlarvaldevelopmentofthelocustlocustamigratoria |
| _version_ |
1768545912669339648 |