To write:
The type of behaviour which is carried out in a sequence of specific actions in response to a stimulus.
Introduction:
Stimulus is the changes in the environmental conditions to which the organism tend to respond. Every living organism responds when an external stimulus act on it.
Explanation of Solution
A fixed pattern of behaviour is a series of actions caused by a cue, known as key stimulus. Although a fixed pattern of action is more complex than a reflex, it is still automatic and involuntary. Once stimulated, it will continue the process of completion even if the key stimulus is removed.
Fixed action patterns are invariant and are generated by a neural network known as an innate release mechanism in response to an external sensory stimulus identified as a sign trigger or releaser (a signal from one person to another).
A well- studied example of a fixed action patterns occurs in Ground-resting water birds like Greyleg geese. If the egg of a female grayleg goose rolls out of her nest, she instinctively uses her bill to push the egg back into the nest in a series of highly stereotypical, predictable movements. The image of an egg in the mind of the goose,which is outside the nest is a stimulus that triggers the recovery behaviour.
A fixed action pattern is not learned but it is hereditary in nature.
Sign triggers are often encountered while following a fixed action pattern (FAP) that is an intrinsic trait with very little variation in the way the actions are performed.
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