. The evolution of animal intelligence . Animal intelligence; Psychology, Comparative. THE BEHAVIOR OF PROTOZOA 73 Paramoecium is a very restless organism, swimming actively much of the time. Occasionally it remains quiet when in contact with solid objects. When manifesting its so-called thigmotactic response the cilia in contact with the solid remain stiff and immobile as if anchoring the animal to the spot, while the cilia over the rest of the body keep moving, although with diminished vigor. If bits of cotton wool are placed in the water Paramoecia are more apt to come to rest, owing to the
. The evolution of animal intelligence . Animal intelligence; Psychology, Comparative. THE BEHAVIOR OF PROTOZOA 73 Paramoecium is a very restless organism, swimming actively much of the time. Occasionally it remains quiet when in contact with solid objects. When manifesting its so-called thigmotactic response the cilia in contact with the solid remain stiff and immobile as if anchoring the animal to the spot, while the cilia over the rest of the body keep moving, although with diminished vigor. If bits of cotton wool are placed in the water Paramoecia are more apt to come to rest, owing to the greater opportunity afforded of. Fig. 9.—Successive stages of the motor reflex of Paramoecium. (After Jennings.) securing contact stimuli. This trait keeps the Paramcecia among bacterial scums and in other situations where they may obtain their food. The principal feature of the behavior of Paramoecia is what Jennings has called the "motor-reflex" or "avoiding ; It consists of swimming backward by reversal of the action of the cilia, turning to the aboral side and then going ahead again. This is the stereotyped response which Paramoecium gives in essentially the same way when en- countering almost any kind of stimulus. If stimulated by a fine needle on the aboral side it will back off and turn to- ward instead of away from the stimulating object. Even. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Holmes, Samuel J. (Samuel Jackson), 1868-1964. New York : Holt
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