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EFFECTS OF HANDLING ON EXPLORATORY AND EMOTIONAL BEHAVIOR OF MALE AND FEMALE LEWIS RATS

100%
Matysiak J., Farley D., Trojan M., Osinski J.
Psychologia-Etologia-Genetyka
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2007
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vol. 15
75-88
EN
Exploration is considered to be a form of spontaneous activity and it seems to be a stable and phylogeniticaly old phenomenon. In laboratory conditions, many different methods are applied for measurement of activity motivated by need for stimulation. In our experiment we have decided to apply battery of tests - open field, elevated cross-maze and self-exposure chamber, assuming that these tests most fully and complementary measure various aspects of exploratory activity. Experimental factors influencing exploration activity which we decided to test are variables 'handling' and 'sex'. Obtained results show appropriate selection of research methods. An additive effect of experimental factors on indicators of exploratory behavior as well as on emotional behavior, except number of urinations in open field test and lack of interaction of 'handling' and 'sex' factors seems to support postulate of conducting research on mixed samples of males and females. Our results also confirm earlier signaled, existence of two independent motivational systems: one regulating behavior, aimed at new stimuli (expressed by alternation) and second adjusting general level of exploratory activity.
2

The effects of handling on the exploratory activity of rats in settings varying in level of sensory stimulation

100%
Osinski J., Matysiak J.
Polish Psychological Bulletin
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2008
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vol. 39
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issue 2
89-97
EN
This study tests the assumptions of need for stimulation theory. According the main hypothesis of this theory, the stimulus seeking activity of an organism in an unfamiliar environment is affected by two main temperamental traits: emotional reactivity and need for stimulation. In a familiar setting, the influence of emotional reactivity disappears, while the need for stimulation persists. Two experiments were run in which animals' emotionality was manipulated by means of presence or absence of handling and the level of environmental stimulation was manipulated by varying the intensity of light to which the animals were exposed. Sixty male Wistar rats were tested in the first experiment. Stimulus seeking activity was registered in the Skinner-type chambers where animals could switch the light on by every head dip into one of two holes, the so-called experimental hole. Animals were tested in five 30-minute sessions repeated every 48 hours. As predicted, the effect of emotionality on exploration emerged at the beginning of the experiment (handled rats demonstrated a stronger preference for the experimental hole), whereas the effect of the level of environmental stimulation on the total number of head-dips emerged in all the experimental sessions. The second experiment involved 40 rats and followed a similar design, but the stimulus seeking activity was measured in the situation where the animals could switch the light off by dipping their heads into the experimental hole. Contrary to predictions, the experimental factors had no significant effect on the animals' stimulus seeking activity. Only the results of the first experiment confirm the assumptions of need for stimulation theory.
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