The terms " sign stimulus " and " releaser " are sometimes used interchangeably; however, they have different meanings.
2.
The term " sign stimulus " is used to denote a feature of an animal's environment that elicits a particular response.
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The sign stimulus is a simple, reduced stimulus including only the necessary features of the stimulus capable of evoking a behavioral response.
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In his own paper, Barlow later compared a sign stimulus to a password which was either accepted or rejected by a feature detector.
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Tinbergen showed that the red colour on the throat of the territorial male acts as a simple sign stimulus, releasing aggression in other males and attracting females.
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On the other hand, during Barlow's career, Nikolaas Tinbergen was introducing the concept of the innate release mechanism ( IRM ) and sign stimulus.
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The chick encourages the host to keep pace with its high growth rate with its rapid begging call and the chick's open mouth which serves as a sign stimulus.
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Fixed action patterns, or similar behaviour sequences, are produced by a sensory stimulus known as a "'sign stimulus "'or "'releaser " '.
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In areas where their ranges overlap, " Mohavea confertifolia " attracts the same pollinators to its flowers through floral mimicry : " Mohavea " flowers contain marks that resemble female " Xeralictus "; these marks operate as a sign stimulus to the male bee, which enters the flower and in doing so pollinates the " Mohavea ".
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