INVESTIGADORES
TOMSIC Daniel
artículos
Título:
Physiology and Morphology of Visual Movement Detector Neurons in a Crab (Decapoda: Brachyura).
Autor/es:
BERÓN DE ASTRADA M. AND TOMSIC D
Revista:
JOURNAL OF COMPARATIVE PHYSIOLOGY A-SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
Editorial:
SPRINGER
Referencias:
Año: 2002 vol. 188 p. 539 - 551
ISSN:
0340-7594
Resumen:
Abstract
Although visually elicited behaviors have been
extensively studied in crabs, their investigation at the
neurophysiological level is scant. The present study is a
physiological and morphological description of intracellularly
recorded and dye injected visual movement
detector neurons that respond to the same stimulus that
elicits the escape response in the crab Chasmagnathus
granulatus. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
granulatus. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
extensively studied in crabs, their investigation at the
neurophysiological level is scant. The present study is a
physiological and morphological description of intracellularly
recorded and dye injected visual movement
detector neurons that respond to the same stimulus that
elicits the escape response in the crab Chasmagnathus
granulatus. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
granulatus. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
Although visually elicited behaviors have been
extensively studied in crabs, their investigation at the
neurophysiological level is scant. The present study is a
physiological and morphological description of intracellularly
recorded and dye injected visual movement
detector neurons that respond to the same stimulus that
elicits the escape response in the crab Chasmagnathus
granulatus. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
granulatus. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
Chasmagnathus
granulatus. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
. The neurons were investigated in intact animals.
The response of movement detector neurons to the
danger stimulus (an object moving above the animal)
consists of a strong discharge of action potentials frequently
superimposed on noisy graded potentials,
whereas the response to stationary changes in illumination
is weak or undetectable. The response to the moving
stimulus is relatively independent of the background intensity
and of the contrast between target and background.
Repeated presentations of the moving stimulus
produce rapid habituation of the neural response. Some
of the neurons also respond to mechanical stimulation.
These physiological results coincide with those from early
studies on visual movement detector fibers of crustaceans
achieved by extracellular recordings. However, there are
no previous morphological studies of these neurons. Intracellular
injection with Lucifer Yellow revealed that
these neurons in Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.
Chasmagnathus arborize extensively in
the internal medulla and in the lateral protocerebrum.
They have their somata located in the cell body cluster
laying beneath the internal medulla. Their axons project
centripetally across the protocerebral tract.