Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice

Upon detection of an approaching object, the crab Neohelice granulata continuously regulates the direction and speed of escape according to ongoing visual information. These visuomotor transformations are thought to be largely accounted for by a small number of motion-sensitive giant neurons project...

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Autores principales: Oliva, Damián Ernesto, Tomsic, Daniel
Publicado: 2016
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Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220949_v219_n21_p3339_Oliva
http://hdl.handle.net/20.500.12110/paper_00220949_v219_n21_p3339_Oliva
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spelling paper:paper_00220949_v219_n21_p3339_Oliva2023-06-08T14:45:39Z Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice Oliva, Damián Ernesto Tomsic, Daniel Collision avoidance Crustacean Escape response Lobula neurons Looming Motion detection action potential animal biological model biophysics Brachyura escape behavior male movement perception nerve cell photostimulation physiology Action Potentials Animals Biophysical Phenomena Brachyura Escape Reaction Male Models, Biological Motion Perception Neurons Photic Stimulation Upon detection of an approaching object, the crab Neohelice granulata continuously regulates the direction and speed of escape according to ongoing visual information. These visuomotor transformations are thought to be largely accounted for by a small number of motion-sensitive giant neurons projecting from the lobula (third optic neuropil) towards the supraesophageal ganglion. One of these elements, the monostratified lobula giant neuron of type 2 (MLG2), proved to be highly sensitive to looming stimuli (a 2D representation of an object approach). By performing in vivo intracellular recordings, we assessed the response of the MLG2 neuron to a variety of looming stimuli representing objects of different sizes and velocities of approach. This allowed us to: (1) identify some of the physiological mechanisms involved in the regulation of the MLG2 activity and test a simplified biophysical model of its response to looming stimuli; (2) identify the stimulus optical parameters encoded by the MLG2 and formulate a phenomenological model able to predict the temporal course of the neural firing responses to all looming stimuli; and (3) incorporate the MLG2-encoded information of the stimulus (in terms of firing rate) into a mathematical model able to fit the speed of the escape run of the animal. The agreement between the model predictions and the actual escape speed measured on a treadmill for all tested stimuli strengthens our interpretation of the computations performed by the MLG2 and of the involvement of this neuron in the regulation of the animal's speed of run while escaping from objects approaching with constant speed. Fil:Oliva, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tomsic, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220949_v219_n21_p3339_Oliva http://hdl.handle.net/20.500.12110/paper_00220949_v219_n21_p3339_Oliva
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Collision avoidance
Crustacean
Escape response
Lobula neurons
Looming
Motion detection
action potential
animal
biological model
biophysics
Brachyura
escape behavior
male
movement perception
nerve cell
photostimulation
physiology
Action Potentials
Animals
Biophysical Phenomena
Brachyura
Escape Reaction
Male
Models, Biological
Motion Perception
Neurons
Photic Stimulation
spellingShingle Collision avoidance
Crustacean
Escape response
Lobula neurons
Looming
Motion detection
action potential
animal
biological model
biophysics
Brachyura
escape behavior
male
movement perception
nerve cell
photostimulation
physiology
Action Potentials
Animals
Biophysical Phenomena
Brachyura
Escape Reaction
Male
Models, Biological
Motion Perception
Neurons
Photic Stimulation
Oliva, Damián Ernesto
Tomsic, Daniel
Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice
topic_facet Collision avoidance
Crustacean
Escape response
Lobula neurons
Looming
Motion detection
action potential
animal
biological model
biophysics
Brachyura
escape behavior
male
movement perception
nerve cell
photostimulation
physiology
Action Potentials
Animals
Biophysical Phenomena
Brachyura
Escape Reaction
Male
Models, Biological
Motion Perception
Neurons
Photic Stimulation
description Upon detection of an approaching object, the crab Neohelice granulata continuously regulates the direction and speed of escape according to ongoing visual information. These visuomotor transformations are thought to be largely accounted for by a small number of motion-sensitive giant neurons projecting from the lobula (third optic neuropil) towards the supraesophageal ganglion. One of these elements, the monostratified lobula giant neuron of type 2 (MLG2), proved to be highly sensitive to looming stimuli (a 2D representation of an object approach). By performing in vivo intracellular recordings, we assessed the response of the MLG2 neuron to a variety of looming stimuli representing objects of different sizes and velocities of approach. This allowed us to: (1) identify some of the physiological mechanisms involved in the regulation of the MLG2 activity and test a simplified biophysical model of its response to looming stimuli; (2) identify the stimulus optical parameters encoded by the MLG2 and formulate a phenomenological model able to predict the temporal course of the neural firing responses to all looming stimuli; and (3) incorporate the MLG2-encoded information of the stimulus (in terms of firing rate) into a mathematical model able to fit the speed of the escape run of the animal. The agreement between the model predictions and the actual escape speed measured on a treadmill for all tested stimuli strengthens our interpretation of the computations performed by the MLG2 and of the involvement of this neuron in the regulation of the animal's speed of run while escaping from objects approaching with constant speed.
author Oliva, Damián Ernesto
Tomsic, Daniel
author_facet Oliva, Damián Ernesto
Tomsic, Daniel
author_sort Oliva, Damián Ernesto
title Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice
title_short Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice
title_full Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice
title_fullStr Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice
title_full_unstemmed Object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice
title_sort object approach computation by a giant neuron and its relationship with the speed of escape in the crab neohelice
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220949_v219_n21_p3339_Oliva
http://hdl.handle.net/20.500.12110/paper_00220949_v219_n21_p3339_Oliva
work_keys_str_mv AT olivadamianernesto objectapproachcomputationbyagiantneuronanditsrelationshipwiththespeedofescapeinthecrabneohelice
AT tomsicdaniel objectapproachcomputationbyagiantneuronanditsrelationshipwiththespeedofescapeinthecrabneohelice
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