INVESTIGADORES
TOMSIC Daniel
artículos
Título:
Visuo-motor transformations involved in the escape response to looming stimuli in the crab Neohelice (=Chasmagnathus) granulata.
Autor/es:
OLIVA DAMIAN; TOMSIC DANIEL
Revista:
JOURNAL OF EXPERIMENTAL BIOLOGY
Editorial:
COMPANY OF BIOLOGISTS LTD
Referencias:
Lugar: Cambridge; Año: 2012 vol. 215 p. 3488 - 3500
ISSN:
0022-0949
Resumen:
SUMMARY
Escape responses to directly approaching predators represent one instance of an animalʼs ability to avoid collision. Usually, such
responses can be easily evoked in the laboratory using two-dimensional computer simulations of approaching objects, known as
looming stimuli. Therefore, escape behaviors are considered useful models for the study of computations performed by the brain
to efficiently transform visual information into organized motor patterns. The escape response of the crab Neohelice (previouslyʼs ability to avoid collision. Usually, such
responses can be easily evoked in the laboratory using two-dimensional computer simulations of approaching objects, known as
looming stimuli. Therefore, escape behaviors are considered useful models for the study of computations performed by the brain
to efficiently transform visual information into organized motor patterns. The escape response of the crab Neohelice (previouslyNeohelice (previously
Chasmagnathus) granulata offers an opportunity to investigate the processing of looming stimuli and its transformation into
complex motor patterns. Here we studied the escape performance of this crab to a variety of different looming stimuli. The
response always consisted of a vigorous run away from the stimulus. However, the moment at which it was initiated, as well as
the developed speed, closely matched the expansion dynamics of each particular stimulus. Thus, we analyzed the response
events as a function of several variables that could theoretically be used by the crab (angular size, angular velocity, etc.). Our
main findings were that: (1) the decision to initiate the escape run is made when the stimulus angular size increases by 7ndeg; (2)
the escape run is not a ballistic kind of response, as its speed is adjusted concurrently with changes in the optical stimulus
variables; and (3) the speed of the escape run can be faithfully described by a phenomenological input¡Voutput relationship based
on the stimulus angular increment and the angular velocity of the stimulus.) granulata offers an opportunity to investigate the processing of looming stimuli and its transformation into
complex motor patterns. Here we studied the escape performance of this crab to a variety of different looming stimuli. The
response always consisted of a vigorous run away from the stimulus. However, the moment at which it was initiated, as well as
the developed speed, closely matched the expansion dynamics of each particular stimulus. Thus, we analyzed the response
events as a function of several variables that could theoretically be used by the crab (angular size, angular velocity, etc.). Our
main findings were that: (1) the decision to initiate the escape run is made when the stimulus angular size increases by 7ndeg; (2)
the escape run is not a ballistic kind of response, as its speed is adjusted concurrently with changes in the optical stimulus
variables; and (3) the speed of the escape run can be faithfully described by a phenomenological input¡Voutput relationship based
on the stimulus angular increment and the angular velocity of the stimulus.ndeg; (2)
the escape run is not a ballistic kind of response, as its speed is adjusted concurrently with changes in the optical stimulus
variables; and (3) the speed of the escape run can be faithfully described by a phenomenological input¡Voutput relationship based
on the stimulus angular increment and the angular velocity of the stimulus.