Behavior of the Lower Organisms

Cover Behavior of the Lower Organisms
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We cannot predict how an animal will react to a given condition unless we know the state of its internal physiological processes, and often whether a positive or negative reaction will help or hinder the normal course of these processes. The external processes •of behavior are an outgrowth and continuation of the internal processes.
The state of the organism as regards its metaboHc processes seems indeed the most important determining factor in its behavior. Certain internal metabolic states dr
...ive the animal, without the action of any •external agent, to the performance of long trains of activity, of exactly the same character as may also be induced by external stimulation.
'The state of the metaboHc processes likewise determines the general nature and the details of the reactions to external stimuli. It decides whether Hydra shall creep upward to the surface and toward the hght, or shall sink to the bottom ; how it shall react to chemicals and to solid -objects; whether it shall remain quiet in a certain position, or shall reverse this position and undertake a laborious tour of exploration.


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