Effects of Isolation upon the Dyadic Structure of Individual Behavior in Mice
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At 20 days of age, thirty-six ICR/JCL male mice were randomly assigned to one of the following housing conditions ; in isolation (N = 18) and in groups of three (N =18). Following 45± 5 days of confinement in each housing condition, animals were placed singly and left for an hour in one of two compartments of an observation cage divided by a partition. On the next day subjects were again placed in the same way as the previous day. Ten minutes later, the partition was removed and the animal was permitted access to the entire cage. The behavior of each animal was recorded for twenty minutes with the aid of VTR system. The recorded behavior was described by the sequential sampling method on the basis of 15 items of behavior (Table 1). In order to examine possible "dyadic" structures, the first-order transition analysis and the single-link cluster analysis were applied to the first 10-min records of behavior. <BR>Two clusters were found in the behavior (Fig. 1); one including the behavioral items accompanied with "stretching" (cluster I) and the other not (cluster II). The internal structures of cluster I were identical between the two housing conditions, but the structure of cluster II in isolated animals differed from that in grouped ones, especially with regard to the partial structure around "rearing", "pausing", and "face-washing" (Fig. 2 and 3). An analysis of transition probabilities in and between the two clusters suggested that cluster I was the initial and transient component of the sequence of behavior (Fig. 2 and 3). This was confirmed by the fact that the number of individuals showing the items with "stretching" markedly decreased approximately within a minute, particularly in grouped animals (Fig. 4). However, in isolated animals a small amount of "stretching" sporadically occurred during the entire observation period.
- 日本動物心理学会の論文
日本動物心理学会 | 論文
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