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Time calibration applies to all records. [From Brunelli et aL, 1972J 44 3. RETICULAR INFLUENCES ON PIGEONS' BEHAVIOR 4i thalamic pigeon (Fig. 6A). Here again the difference of threshold between arrest and arousal responses can be easily demonstrated. Another premating behavior is referred to by the ethologists as nest demonstration or nest calling. The bird lies down, almost immobile, repeatedly nodding the head toward the floor and uttering a call, different in type and lower in intensity than during the bow-cooing.
1972] tendency toward sleep, one that was counteracted by a strongly motivated feeding behavior. Thus, suppression of feeding activities would be indirect cause of sleep. We have not enough data to permit a statistical evaluation. We may simply note that feeding behavior was abolished by the first group of trains, while at least three groups were required to produce sleep. On the other hand, in several cases it was found that the animal did not resume feeding activity after a single group of trains, possibly because the cup containing the corn had disappeared from the visual field, following a movement.
In these successful preparations the onset of the usual patterns of waking behavior is also precocious. Self-cleaning activities, particularly preening, may appear within 24 hr. Feeding activities—including pecking movements, seizing and swallowing food, drinking—appear later, within 15-20 days. 3. RETICULAR INFLUENCES ON PIGEONS' BEHAVIOR 37 Early authors, including Schrader (1889), denied that a thalamic pigeon could become self-sufficient for feeding and drinking. Only in 1938 didThauer and Peters report that one of their anatomically controlled, thalamic pigeons had started to peck at corn at the 27th day; that it seized and swallowed it 1 o days later; finally that after 5 weeks the animal was completely self-sufficient for b o t h feeding and drinking.