Vacuum Activity
Vacuum activities (or vacuum behaviours) are innate, fixed action patterns of animal behaviour that are performed in the absence of the external stimuli (releaser) that normally elicit them. This type of abnormal behaviour shows that a key stimulus is not always needed to produce an activity. Vacuum activities can be difficult to identify because it is necessary to determine whether any stimulus triggered the behaviour.
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Famous quotes containing the word activity:
“In communist society, where nobody has one exclusive sphere of activity but each can become accomplished in any branch he wishes, society regulates the general production and thus makes it possible for me to do one thing today and another tomorrow, to hunt in the morning, fish in the afternoon, rear cattle in the evening, criticize after dinner, just as I have a mind, without ever becoming hunter, fisherman, shepherd or critic.”
—Karl Marx (1818–1883)