The researchers led by Professor Giorgio Vallortigara of the University of Trieste found that when the dogs were shown their owners --- a positive experience --- their tails wagged energetically to the right side. When they were shown an unfamiliar human they wagged to the right, but with somewhat less enthusiasm. The appears of a cat again caused a right-hand side wag, although with less excitement again. The appearance of a large unfamiliar dog, similar to a German shepherd, changed to direction of tail wagging to the left. Researchers supposed the dog was thinking of moving back. When the dogs were not shown any stimuli they tended to wag their tails to the left, suggesting they preferred company. While the changes in the tail wagging were not easily noticed without the aid of video, it was thought that the findings could help people judge the mood(心情) of dogs. Computer and video systems, for example, could be used by professional dog trainers to determine the mood of dogs that they were required to approach.
36. The video cameras were used to catch the dogs reactions because ____.
A. it was easier to catch the dogs’ reaction changes in the tail wagging
B. the dogs were put in the wooden boxes and tested one at a time.
C. they enabled the dogs’ owners to know about their dogs’ habit
D. the dogs wagged their tails in different directions when they were in different moods
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