A sign stimulus is a simple features of a more complex stimuli
that produced predictable results of an organism. The bright
plumage and magnificent tail of a peacock is a good example of a
sign stimulus as it helps the peacock to attract a peahen.
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Hoffman's sign in physiology is a sign of nerve regeneration
triggered by a stimulus of the distal part of an injured nerve.
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stimulus
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Possibly, but some movements are just involuntary reactions to
stimulus