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Escape responses to directly approaching predators represent one instance of an animal's 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 (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 7 deg; (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-output relationship based on the stimulus angular increment and the angular velocity of the stimulus. © 2012. Published by The Company of Biologists Ltd.


Documento: Artículo
Título:Visuo-motor transformations involved in the escape response to looming stimuli in the crab Neohelice (=Chasmagnathus) granulata
Autor:Oliva, D.; Tomsic, D.
Filiación:Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Saenz Peña, Bernal (1876), Provincia Buenos Aires, Argentina
Laboratorio de Neurobiología de la Memoria, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2 Ciudad Universitaria (1428), Ciudad de Buenos Aires, Argentina
Palabras clave:Crustacea; Escape response; Looming detection; Visual behavior; animal; article; biological model; biomechanics; Brachyura; escape behavior; male; motor activity; photostimulation; physiology; time; vision; Animals; Biomechanics; Brachyura; Escape Reaction; Male; Models, Biological; Motor Activity; Photic Stimulation; Time Factors; Visual Perception; Animalia; Chasmagnathus; Crustacea; Decapoda (Crustacea)
Página de inicio:3488
Página de fin:3500
Título revista:Journal of Experimental Biology
Título revista abreviado:J. Exp. Biol.


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---------- APA ----------
Oliva, D. & Tomsic, D. (2012) . Visuo-motor transformations involved in the escape response to looming stimuli in the crab Neohelice (=Chasmagnathus) granulata. Journal of Experimental Biology, 215(19), 3488-3500.
---------- CHICAGO ----------
Oliva, D., Tomsic, D. "Visuo-motor transformations involved in the escape response to looming stimuli in the crab Neohelice (=Chasmagnathus) granulata" . Journal of Experimental Biology 215, no. 19 (2012) : 3488-3500.
---------- MLA ----------
Oliva, D., Tomsic, D. "Visuo-motor transformations involved in the escape response to looming stimuli in the crab Neohelice (=Chasmagnathus) granulata" . Journal of Experimental Biology, vol. 215, no. 19, 2012, pp. 3488-3500.
---------- VANCOUVER ----------
Oliva, D., Tomsic, D. Visuo-motor transformations involved in the escape response to looming stimuli in the crab Neohelice (=Chasmagnathus) granulata. J. Exp. Biol. 2012;215(19):3488-3500.