Behavioral and Brain Sciences 10 (3):337-368 (1987)

“Sign stimuli” elicit specific patterns of behavior when an organism's motivation is appropriate. In the toad, visually released prey-catching involves orienting toward the prey, approaching, fixating, and snapping. For these action patterns to be selected and released, the prey must be recognized and localized in space. Toads discriminate prey from nonprey by certain spatiotemporal stimulus features. The stimulus-response relations are mediated by innate releasing mechanisms with recognition properties partly modifiable by experience. Striato-pretecto-tectal connectivity determines the RM's recognition and localization properties, whereas medialpallio-thalamo-tectal circuitry makes the system sensitive to changes in internal state and to prior history of exposure to stimuli. RMs encode the diverse stimulus conditions referring to the same prey object through different combinations of “specialized” tectal neurons, involving cells selectively tuned to prey features. The prey-selective neurons express the outcome of information processing in functional units consisting of interconnected cells. Excitatory and inhibitory interactions among feature-sensitive tectal and pretectal neurons specify the perceptual operations involved in distinguishing the prey from its background, selecting its features, and discriminating it from predators. Other connections indicate stimulus location. The results of these analyses are transmitted by specialized neurons projecting from the tectum to bulbar/spinal motor systems, providing a sensorimotor interface. Specific combinations of such projective neurons – mediating feature- and space-related messages – form “command releasing systems” that activate corresponding motor pattern generators for appropriate prey-catching action patterns.
Keywords action patterns   command systems   connectionist networks   feature analysis   neuroethology   neuromodulation   prey capture   releasing mechanisms   sensorimotor interface   sign stimuli   toad   vision
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DOI 10.1017/s0140525x00023128
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References found in this work BETA

The Language of Thought.Jerry A. Fodor - 1975 - Harvard University Press.
What is It Like to Be a Bat?Thomas Nagel - 1974 - Philosophical Review 83 (October):435-50.
The Perception Of The Visual World.James J. Gibson - 1950 - Boston: Houghton Mifflin.

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Consciousness, Explanatory Inversion and Cognitive Science.John R. Searle - 1990 - Behavioral and Brain Sciences 13 (1):585-642.
Precis of the Intentional Stance.Daniel C. Dennett - 1988 - Behavioral and Brain Sciences 11 (3):495-505.

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