The Effect of Emotional Stimuli on Behavior in the Multiple Choice Situation:Several Aspects of Behavior in the Semicircular Maze (3)
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概要
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Three groups of 18 albino rats each were given twenty successive freechoice trials per day for seven days, i. e., a conditioning period, in a semicircular maze which had eight equal goalboxes. The following day was an extinction period of sixty trials. The groups differed with respect to the period in which they received the emotional stimuli. Group EC received them immediately before each of the last five days of the conditioning period, and Group EE was given immediately before the extinction period. Group C did not receive them during all periods.<BR>The emotional stimuli consisted of three different components; i. e., the electric shock through a grid, the bright light and the loud sound, which simultaneously given for ten seconds at intervals of five seconds during five minutes at a small pen-box placed in another room.<BR>In Group EC the emotional stimuli gradually decreased behavior variability until the 5th or 6th day of the conditioning period. Differences in behavior variability between Group EC and Group C during the last five days of conditioning were statistically significant. Although Group C indicated a progressive decrement of behavior variability in extinction, the decremental effect of the emotinal stimuli on behavior variability was found at the later stage of extinction in Group EE. But jumping responses in Group EE increased from the early stage of the extinction period. In the previous experiment and in Group C, it was found that these jumping responses were characteristic of the later stage of extinction. So the emotional stimuli given before extinction might facilitate an appearance of some emotional aspects which ordinarily occurred at the later stage of extinction.
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